100 Frequently used queries in Sql Server – Part 1

This article lists out the fifty frequently used queries by the Sql Server Developers. The next article (i.e part 2 of this article) lists out another 50 frequently used queries by the Sql Server Developers. Hope you will like this article and if any of your commonly used query is not listed here, please let me know. I will definitely post it and we can help together to the Sql Server Developers community

1. How to check if a Database exists in Sql Server

We can use DB_ID() function like below to check if a database exists. Here in the below script we are checking the existence of the database SqlHintsDB. We can as well use the sys.databases Catalog View to check the existence of the database.

IF DB_ID('SqlHintsDB') IS NOT NULL
BEGIN
	PRINT 'Database Exists'
END

RESULT:
Database existence check using DB_ID() function

To know the various alternative approaches to check the existence of a database read: How to check if a Database exists in Sql Server

2. How to check if a Table exists in Sql Server

We can use the sys.Tables catalog view to check the existence of the Table. Here in the below script we are checking the existence of the table Customers

IF EXISTS(SELECT 1 FROM sys.Tables 
          WHERE  Name = N'Customers' AND Type = N'U')
BEGIN
  PRINT 'Table Exists'
END

RESULT
Check Table Existance Using Sys.Tables Catalog view

To know the various approaches to check the existence of a table read: How to check if a Table exists in Sql Server

3. How to check if a Temp table exists in Sql Server

Below script shows how we can check the existence of a Temporary Table. As we know temp tables are created in TempDB database, so we need to check the existence of the temp table in TempDB database. In the below script we are checking the existence of the temp table #TempTable

IF OBJECT_ID('TempDB.dbo.#TempTable') IS NOT NULL
BEGIN
  PRINT '#TempTable Temporary Table Exists'
END
GO

RESULT:
How to Check if Temporary Table exists in Sql Server

To understand this in detail with examples, you may like to read the article : How to check if Temp table exists in Sql Server?

4. How to check if a Stored Procedure exists in Sql Server

We can use the sys.procedures catalog view to check the existence of a stored proedure. Here in the below script we are checking the existence of the stored procedure GetCustomers

USE SqlHintsDemoDB
GO
IF EXISTS(SELECT 1 FROM sys.procedures 
          WHERE Name = 'GetCustomers')
BEGIN
	PRINT 'Stored Procedure Exists'
END

RESULT:
Check Stored Procedure Existence using sys.procedures

To know the various alternative approaches to check the existence of a stored procedure read: How to check if a Stored Procedure exists in Sql Server

5. How to check if a Function exists in Sql Server

We can use the sys.objects catalog view to check the existence of a User Defined Function. Here in the below script we are checking the existence of the User Defined Function GetEmployeeDetail

USE SqlHintsFunctionExists
GO
IF EXISTS (SELECT 1 FROM sys.objects 
           WHERE Name = 'GetEmployeeDetail' 
             AND Type IN ( N'FN', N'IF', N'TF', N'FS', N'FT' ))
BEGIN
    PRINT 'User defined function Exists'
END

RESULT:
Function Exists Usig Sys Objects Example 1

To know the various alternative approaches to check the existence of a user defined function read: How to check if a Function exists in Sql Server

6. How to check if a VIEW exists in Sql Server

We can use the sys.views catalog view to check the existence of a View. Here in the below script we are checking the existence of the View vwGetCustomerInfo

IF EXISTS(SELECT 1 FROM sys.views 
     WHERE Name = 'vwGetCustomerInfo')
	BEGIN
		PRINT 'View Exists'
	END

RESULT:
Check-View-Existence-using-sys.views 1

To know various alternative approaches to check the existence of a View read: How to check if a VIEW exists in Sql Server

7. How to check if an Index exists in Sql Server

We can use sys.indexes catalog view to check the existence of a Clustered and Non-Clustered indexes. We can execute a query like below to check the existence of a Index IX_Customer_Id on the Customer table created with a default schema (i.e. dbo).

IF EXISTS (SELECT 1
			FROM sys.indexes I
				INNER JOIN sys.tables T
					ON I.object_id = T.object_id
				INNER JOIN sys.schemas S
					ON S.schema_id = T.schema_id
			WHERE I.Name = 'IX_Customer_Id' -- Index name
				AND T.Name = 'Customer' -- Table name
				AND S.Name = 'dbo') --Schema Name
BEGIN
	PRINT 'Index Exists!'
END

RESULT:
Check existence of a Clustered Index by using sys indexes catalog view

To know various alternative approaches to check the existence of a Index read: How to check if an Index exists in Sql Server

8. How to find all the tables with no indexes in Sql Server

We can write a query like below to get all the Tables in the Database that don’t have any indexes:

SELECT Name 'Tables without any Indexes'
FROM SYS.tables
WHERE OBJECTPROPERTY(OBJECT_ID,'TableHasIndex')=0

RESULT:
List_All_Tables_Without_Any_Indexes

To understand this in detail with examples, you may like to read the article: How to find all the tables with no indexes in Sql Server

9. How to find all the indexes that have included columns

We can write a query like below to get the name of all the indexes that have included columns in it and the name of the table to which the index belongs to:

SELECT DISTINCT T.Name 'Table Name',
		I.Name 'Index Name',
		I.type_desc 'Index Type',
		C.Name 'Included Column Name'
FROM sys.indexes I 
 INNER JOIN sys.index_columns IC 
  ON  I.object_id = IC.object_id AND I.index_id = IC.index_id 
 INNER JOIN sys.columns C 
  ON IC.object_id = C.object_id and IC.column_id = C.column_id 
 INNER JOIN sys.tables T 
  ON I.object_id = T.object_id 
WHERE is_included_column = 1
ORDER BY T.Name, I.Name

RESULT:
How_To_Find_All_Indexes_With_Included_Column

To understand this in detail with examples, you may like to read the article: How to find all the indexes that have included columns

10. How to find all the filtered indexes or all the tables having filtered indexes in Sql Server

We can write a query like below to get the name of all the filtered indexes or all the tables having filtered indexes in Sql Server:

SELECT DISTINCT T.Name 'Table Name',
  I.Name 'Filtered Index Name',
  I.Filter_Definition 'Filter Definition'
FROM sys.indexes I		
      INNER JOIN sys.tables T 
        ON I.object_id = T.object_id 
WHERE I.has_filter = 1
ORDER BY T.Name, I.Name

RESULT:
How_To_Find_All_Filtered_Indexes_Or_Tables_With_Filtered_Index

To understand this in detail with examples, you may like to read the article: How to find all the filtered indexes or all the tables having filtered indexes in Sql Server

[ALSO READ] A-Z of Filtered Indexes with examples in Sql Server

11. How to get all HEAP Tables or Tables without Clustered Index in Sql Server

A Table that doesn’t have a Clustered Index is referred to as a HEAP Table. We can write a query like below to get all the HEAP Tables or tables that doesn’t have Clustered Index:

SELECT T.Name 'HEAP TABLE'
FROM sys.indexes I		
	INNER JOIN sys.tables T 
		ON I.object_id = T.object_id 
WHERE I.type = 0 AND T.type = 'U'

RESULT:
List_all_HEAP_Tables_or_Tables_without_Clustered_Index

To understand this in detail with examples, you may like to read the article: How to get all HEAP Tables or Tables without Clustered Index in Sql Server

12. How to get all the Tables with Primary Key Constraint in Sql Server

We can write a query like below to get all the Tables with Primary key constraint:

SELECT T.name 'Table with Primary Key'
FROM SYS.Tables T
WHERE OBJECTPROPERTY(object_id,'TableHasPrimaryKey') = 1
      AND type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without Primary Key Constraint in Sql Server?

13. How to get all the Tables without Primary Key Constraint in Sql Server

We can write a query like below to get all the Tables without Primary key constraint:

SELECT T.name 'Table without Primary Key'
FROM SYS.Tables T
WHERE OBJECTPROPERTY(object_id,'TableHasPrimaryKey') = 0
      AND type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without Primary Key Constraint in Sql Server?

14. How to get all the Tables with Non-Clustered Indexes in Sql Server

We can write a query like below to get all the Tables with Non-Clustered indexes:

--List of all the Tables that have Non-Clustered Indexes
SELECT Name 'Tables with Non-Clustered Indexes'
FROM SYS.tables
WHERE OBJECTPROPERTY(OBJECT_ID,'TableHasNonclustIndex') = 1
		AND Type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without Non-Clustered Indexes in Sql Server?

15. How to get all the Tables without any Non-Clustered Indexes in Sql Server

We can write a query like below to get all the Tables without any Non-Clustered indexes:

--List of all the Tables with NO Non-Clustered Indexes
SELECT Name 'Tables without any Non-Clustered Indexes'
FROM SYS.tables
WHERE OBJECTPROPERTY(OBJECT_ID,'TableHasNonclustIndex') = 0
		AND Type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without Non-Clustered Indexes in Sql Server?

16. How to get all the Tables with an Identity column in Sql Server

We can write a query like below to get all the Tables with Identity column:

SELECT name 'Table with Identity column'
FROM SYS.Tables
WHERE OBJECTPROPERTY(object_id,'TableHasIdentity') = 1
      AND type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without an Identity column in Sql Server?

17. How to get all the Tables without an Identity column in Sql Server

We can write a query like below to get all the Tables without Identity column:

SELECT name 'Table without Identity column'
FROM SYS.Tables
WHERE OBJECTPROPERTY(object_id,'TableHasIdentity') = 0
      AND type = 'U'

To understand this in detail with examples, you may like to read the article: How to get all the Tables with or without an Identity column in Sql Server?

18. How to find all the Stored Procedures having a given text in it

We can write a script like below to get all the stored all the Stored Procedures having a given text in its definition. Here we are searching for the text SearchString in all the stored procedures

SELECT OBJECT_NAME(object_id), 
       OBJECT_DEFINITION(object_id)
FROM sys.procedures
WHERE OBJECT_DEFINITION(object_id) LIKE '%SearchString%'

To understand this in detail with examples, you may like to read the article: How to find all the Stored Procedures having a given text in it?

19. How to find all tables that have specified column name in Sql Server

We can use a script like below to find all the tables in the database that have column with specified name in it. Here we are searching for all the tables that have columns with a name having a text ColumnName in it.

SELECT SCHEMA_NAME(schema_id) + '.' + t.name AS 'Table Name'
FROM sys.tables t 
     INNER JOIN sys.columns c
        ON c.object_id = t.object_id
WHERE c.name like '%ColumnName%'
ORDER BY 'Table Name'

To understand this in detail with examples, you may like to read the article: How to find all tables that have specified column name in Sql Server?

20. How to find all dependencies of a table in Sql Server

We can use the Dynamic Management Function sys.dm_sql_referencing_entities to get all the entities in the current database that refer to the specified table. In this script we are trying to get the Employee tables dependencies

SELECT referencing_schema_name, referencing_entity_name, 
 referencing_id, referencing_class_desc
FROM sys.dm_sql_referencing_entities
             ('dbo.Employee', 'OBJECT')
GO

RESULT:
dm_sql_referencing_entities
Note: While specifying the table name please include schema name also, otherwise result will not display the dependencies.

To understand this in detail with examples, you may like to read the article: How to find all dependencies of a table in Sql Server?

21. How to find referenced/dependent objects (like Table, Function etc) of a Stored Procedure/Function in Sql Server

We can use the Dynamic Management Function sys.dm_sql_referenced_entities to get all the entities in the current database which are referenced by a stored procedure or function. Now we can use a script like below to find all the entities in the current database which are referenced by the stored procedure dbo.GetEmployeeDetails

SELECT referenced_schema_name, referenced_entity_name, 
 referenced_minor_name
FROM sys.dm_sql_referenced_entities
              ('dbo.GetEmployeeDetails', 'OBJECT')
GO

RESULT:
dm_sql_refererenced_entities
Note: While specifying the stored procedure name please include schema name also, otherwise referenced objects list will not be displayed.

To understand this in detail with examples, you may like to read the article: How to find referenced/dependent objects (like Table, Function etc) of a Stored Procedure/Function in Sql Server?

22. How to get first day of the previous quarter

--First day of the previous quarter
SELECT DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) - 1, 0)

RESULT:
FirstDayofPreviousQuarter

23. How to get first day of the current quarter

--First day of the current quarter
SELECT DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0) 

RESULT:
FirstDayofCurrentQuarter

24. How to get first day of the next quarter

--First day of the next quarter
SELECT DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) + 1, 0) 

RESULT:
FirstDayofNextQuarter

25. How to get first day of the quarter for any given date

DECLARE @date DATETIME
SET @date = '07/28/2016'
SELECT DATEADD(qq, DATEDIFF(qq, 0, @date), 0) 

RESULT:
FirstDayofQuarterforAnyGivenDate

26. How to get last day of the previous quarter

--Last day of the previous quarter
SELECT DATEADD (dd, -1, 
           DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0))

RESULT:
LastDayofPreviousQuarter

27. How to get last day of the current quarter

--Last day of the current quarter 
SELECT DATEADD (dd, -1, 
           DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) +1, 0))

RESULT:
LastDayofCurrentQuarter

28. How to get last day of the next quarter

--Last day of the next quarter 
SELECT DATEADD (dd, -1, 
           DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) +2, 0))

RESULT:
LastDayofNextQuarter

29. How to get last day of the quarter for any given date

DECLARE @date DATETIME = '07/28/2016'
SELECT DATEADD (dd, -1, 
           DATEADD(qq, DATEDIFF(qq, 0, @date) +1, 0))

RESULT:
LastDayofQuarterForAnyDate

30. How to get first day of the previous month

--First day of the previous month
SELECT DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0)

RESULT:
FirstDayofPreviousMonth

31. How to get first day of the current month

--First day of the current month
SELECT DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0)

RESULT:
FirstDayofCurrentMonth

32. How to get first day of the next month

SELECT DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 1, 0)

RESULT:
FirstDayofNextMonth

33. How to get first day of the month for any given date

--First day of the month for any given date
DECLARE @date DATETIME = '07/28/2016'
SELECT DATEADD(mm, DATEDIFF(mm, 0, @date), 0)

RESULT:
FirstDayofMonthforAnyGivenDate

34. How to get last day of the previous month

--Last day of the previous month
SELECT DATEADD(dd, -1, 
	   DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0))

RESULT:
LastDayofPreviousMonth

35. How to get last day of the current month

--Last day of the current month
SELECT DATEADD(dd, -1, 
           DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 1, 0))

RESULT:
Last

36. How to get last day of the next month

--Last day of the next month
SELECT DATEADD(dd, -1, 
           DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 2, 0))

RESULT:
LastDayofNextMonth

37. How to get last day of the month for any given date

--Last day of the month for any given date
DECLARE @date DATETIME = '07/28/2016'
SELECT DATEADD(dd, -1, 
           DATEADD(mm, DATEDIFF(mm, 0, @date) + 1, 0))

RESULT:
LastDayofMonthForAnyDate
[ALSO READ] EOMONTH FUNCTION IN SQL SERVER 2012

38. How to get all tables in a Database

We can use the sys.Tables catalog view to get the list of all the tables in a database. Here in the below script we are trying to get list of all the tables in the SqlhintsDemoDB database

USE SqlhintsDemoDB
GO
SELECT * FROM sys.tables

RESULT:
GetAllTablesofDatabase

39. How to get all stored procedures in a database

We can use sys.procedures catalog view to get the list of all the stored procedures in a database

SELECT * FROM sys.procedures

40. How to get all functions in a database

We can use sys.objects catalog view as shown in the below script to get all the functions in a database. Here joining with sys.sql_modules to display the function definition.

SELECT o.Name, m.[Definition], o.type_desc 
FROM sys.objects o
		INNER JOIN sys.sql_modules m 
			ON m.object_id=o.object_id
WHERE o.type_desc like '%function%'

RESULT:
Get All Functions In a Database

41. How to check the definition or content of a stored procedure in Sql Server

We can use the system stored procedure sp_helptext to check the definition of a Stored Proccedure in Sql Server. In the below example we are using the sp_helptext system stored procedure to check the definition of the Stored Procedure GetCityCustomers.

sp_helptext GetCityCustomers

RESULT:
How to check Stored Procedure Definition or Content

42. How to check if a record exists in a table in Sql Server

Below example script checks the existence of the customer record with CustId = 2 in the IF statement

DECLARE @CustId INT = 2
IF EXISTS(SELECT 1 FROM dbo.Customer WITH(NOLOCK)
          WHERE CustId = @CustId)
	BEGIN
		PRINT 'Record Exists'
	END
ELSE
	BEGIN
		PRINT 'Record doesn''t Exists'
	END

RESULT:
Check if record exists in a table in Sql Server 1

To know more on using the EXISTS clause to check the existence of the record in IF statement, CASE Statement, WHERE clause etc read the article: How to check if a record exists in table in Sql Server

43. How to rename column name in Sql Server

We can use the system stored procedure SP_RENAME to rename the table column. Below is the SYNTAX of the SP_RENAME system stored procedure for renaming the column name:

SYNTAX:

SP_RENAME 'TableName.OldColumnName' , 'NewColumnName', 'COLUMN'

Example 1: Rename Customer table column CustName to FullName using SP_RENAME

SP_RENAME 'Customer.CustName' , 'FullName', 'COLUMN'

Result:
Rename column name in Sql Server 2

To know more table column rename option with extensive list of examples you may like to read the article: How to rename column name in Sql Server

44. How to get month name from date in Sql Server

We can use DATENAME() function to get Month name from Date in Sql Server, here we need specify datepart parameter of the DATENAME function as month or mm or m all will return the same result.

SELECT GETDATE() 'Today', DATENAME(month,GETDATE()) 'Month Name'
SELECT GetDate() 'Today', DATENAME(mm,GETDATE()) 'Month Name'
SELECT GetDate() 'Today', DATENAME(m,GETDATE()) 'Month Name'

RESULT:
Month name from date in sql server 1

We can also get the Month name from date by using the FORMAT function. To know more on this you may like to read the article: How to get month name from date in Sql Server

45. How to get Day or Weekday name from date in Sql Server

We can use DATENAME() function to get Day/Weekday name from Date in Sql Server, here we need specify datepart parameter of the DATENAME function as weekday or dw both will return the same result.

SELECT GETDATE() 'Today', DATENAME(weekday,GETDATE()) 'Day Name'
SELECT GetDate() 'Today', DATENAME(dw,GETDATE()) 'Day Name'

RESULT:
Day or weekday name from Date Sql Server 1

We can also get the Day or Weekday name from date by using the FORMAT function. To know more on this you may like to read the article: How to get Day or Weekday name from date in Sql Server

46. How to find whether a Table is referenced by the Foreign Key constraint defined in another Table in Sql Server

We can use script like below to identify whether a Table is referenced by another Tables foreign key constraints in Sql Server:

SELECT OBJECT_NAME (FK.referenced_object_id) 'Referenced Table', 
 OBJECT_NAME(FK.parent_object_id) 'Referring Table', 
 FK.name 'Foreign Key', 
 COL_NAME(FK.referenced_object_id, FKC.referenced_column_id) 'Referenced Column',
 COL_NAME(FK.parent_object_id,FKC.parent_column_id) 'Referring Column'
FROM sys.foreign_keys AS FK
		INNER JOIN sys.foreign_key_columns AS FKC 
			ON FKC.constraint_object_id = FK.OBJECT_ID
WHERE OBJECT_NAME (FK.referenced_object_id) = 'Enter Table Name'

To understand this in detail with examples, you may like to read the article: How to find whether a Table is referenced by the Foreign Key constraint defined in another Table

47. How to Check if a String Contains a Sub-string in it in Sql Server

We can use the CHARINDEX() function to check whether a String contains a Sub-string in it. Name of this function is little confusing as name sounds something to do with character, but it basically returns the starting position of matched Substring in the main String. If it is not found then this function returns value 0.

Below example demonstrates how we can use the CHARINDEX() function to check whether a String contains a Sub-string in it.

DECLARE @ExpressionToSearch VARCHAR(50) 
SET @ExpressionToSearch = 'Basavaraj Prabhu Biradar'
--Check whether @ExpressionToSearch contains the substring 
--'Prabhu' in it
IF  CHARINDEX('Prabhu', @ExpressionToSearch ) > 0 
	PRINT 'Yes it Contains'
ELSE
	PRINT 'It doesn''t Contain'

RESULT:
Substring_Within_String_Using_CHARINDEX

To know various alternative approaches to check whether a String contains a Sub-string in it, you may like to read the article: How to Check if a String Contains a Substring in it in Sql Server

48. How to get all the records which contain double byte data in a particular NVARCHAR data type column Sql Server

In NVARCHAR DataType column we can store both Single byte and Double byte data. Many a times we want to know, how many records have double byte data in the NVARCHAR data type column. We can write a script like below for this:

--Query to get all the customers whose CustomerName 
--column contains DOUBLE Byte Data
SELECT *
FROM dbo.Customer 
WHERE CustomerName != CAST(CustomerName AS VARCHAR(50))

RESULT:
Double_Byte_Records_In_Sql_Server

To understand this in detail with examples, you may like to go through the article: How to get all the records which contain double byte data or all the records which contain single byte data in Sql Server?

49. How to get all the records which contain only single byte data in Sql Server

In NVARCHAR DataType column we can store both Single byte and Double byte data. Many a times we want to know, how many records have only single byte data in the NVARCHAR data type column. We can write a script like below for this:

-- Query to get all the customers whose CustomerName 
-- column contains SINGLE Byte Data only
SELECT *
FROM dbo.Customer 
WHERE CustomerName = CAST(CustomerName AS VARCHAR(50))

RESULT:
Single_Byte_Records_Sql_Server

To understand this in detail with examples, you may like to go through the article: How to get all the records which contain double byte data or all the records which contain single byte data in Sql Server?

50. How to get Date Part only from DateTime in Sql Server

There are multiple ways of getting date part only from DateTime, below is one such approach. To know various alternative approaches you may like to read the article: How to get Date Part only from DateTime in Sql Server

SELECT CONVERT (DATE, GETDATE()) 'Date Part Only'

RESULT:
How to get Date Part only from DateTime

To know the various alternative approaches to get Date Part only from DateTime in Sql Server you may like to read the article: How to get Date Part only from DateTime in Sql Server

Hope you liked this article and if any of your commonly used query is not listed here, please let me know. I will definitely post it and we can help together to the Sql Server Developers community.

15 thoughts on “100 Frequently used queries in Sql Server – Part 1

  1. I enjoyed reading this article.

    Host seems to be knowledgeable.

    Thanks for educating the community and appreciate your volunteership.

    Thanks a bunch

  2. Really Great Work. Thank you so much.
    Please add information whenever SQL server new features comes and share your experience. The blog will be single point to refer all SQL queries.

    1. Thanks Santhana… Appreciate your comments. Next week expect part-2 of this series listing another 50 frequently used queries in Sql Server…

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