SQL सर्वर डेटाबेस में सभी तालिकाओं से सभी प्राथमिक कुंजियों को कैसे छोड़ें - SQL सर्वर / TSQL ट्यूटोरियल भाग 65

परिदृश्य:

समाधान:

USE YourDatabaseName
GO
--Declare Variables
DECLARE @DatabaseName AS VARCHAR(128)
DECLARE @SchemaName AS VARCHAR(128)
DECLARE @TableName AS VARCHAR(128)
DECLARE @ColumnName AS VARCHAR(128)
DECLARE @ConstraintName AS VARCHAr(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  
INNER JOIN
   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'

OPEN Cur
FETCH NEXT
FROM Cur
INTO @DatabaseName,@SchemaName,@TableName,@ColumnName,
@ConstraintName
WHILE @@FETCH_STATUS = 0
BEGIN
    --Build dynamic sql for each database 
    DECLARE @SQL VARCHAR(MAX) = NULL
   SET @SQL ='Alter table ['
   SET @SQL+=@SchemaName+'].['+@TableName+']'
   SET @SQL+=' Drop Constraint ['
   SET @SQL+=@ConstraintName+']'
    PRINT @SQL
    EXEC (@SQL)
FETCH NEXT
    FROM Cur
    INTO @DatabaseName,@SchemaName,@TableName,@ColumnName,
@ConstraintName
END
CLOSE Cur
DEALLOCATE Cur