How to Rename Primary Key Constraint for Multiple Tables in SQL Server Database - SQL Server / TSQL Tutorial Part 64

Scenario:

You are working as SQL Server Developer or SQL Server DBA. You are working on naming standards for database objects. You noticed that in one of the database the Primary Key Constraints are not following your company naming convention standards that is "Pk_SchemaName_TableName_ColumnName" as shown below in red.

Solution:

USE YourDatabaseName
GO
--Declare Variables
DECLARE @DatabaseName ASVARCHAR(128)
DECLARE @SchemaName ASVARCHAR(128)
DECLARE @TableName ASVARCHAR(128)
DECLARE @ColumnName ASVARCHAR(128)
DECLARE @ConstraintName ASVARCHAr(128)

DECLARE CUR CURSOR
FOR
--Get Primary Key Constraint
Select
   TC.Table_Catalog as DatabaseName,
   TC.Table_Schema AS TableSchema,
   TC.Table_Name AS TableName,
   CCU.Column_Name AS ColumnName,
   TC.Constraint_Name AS ConstraintName
From
   information_Schema.Table_Constraints TC  
INNERJOIN
   Information_Schema.constraint_column_usage CCU  
on TC.Constraint_Name=CCU.Constraint_Name  
and TC.Table_Name=CCU.Table_Name  
where
   Constraint_Type='PRIMARY KEY'
--Change your criteria as per your naming convention 
and'Pk_'+TC.Table_Schema+'_'+TC.Table_Name
   +'_'+CCU.Column_Name<>TC.Constraint_Name
OPEN Cur
FETCHNEXT
FROM Cur
INTO @DatabaseName,@SchemaName,@TableName,@ColumnName,

@ConstraintName
WHILE@@FETCH_STATUS = 0
BEGIN
--Build dynamic sql for each database 
DECLARE @SQLVARCHAR(MAX) = NULL
SET @SQL ='sp_rename '+Char(10)
SET @SQL+='@objname ='''+@SchemaName+'.'+@ConstraintName+''','
SET @SQL+='@newname='''+'Pk_'+@SchemaName
SET @SQL+='_'+@TableName+'_'+@ColumnName+''','
SET @SQL+='@objtype = ''object'''
--EXEC (@SQL)
PRINT @SQL
FETCHNEXT
FROM Cur
INTO @DatabaseName,@SchemaName,@TableName,@ColumnName,

@ConstraintName
END
CLOSE Cur
DEALLOCATE Cur