sql server add unique constraint
-- Add a Unique constraint and deifine the constraint name
ALTER TABLE TableName
ADD CONSTRAINT TableName_ColumnName_Unique UNIQUE (ColumnName)sql server add unique constraint
-- Add a Unique constraint and deifine the constraint name
ALTER TABLE TableName
ADD CONSTRAINT TableName_ColumnName_Unique UNIQUE (ColumnName)how to drop a unique constraint in sql
SHOW CREATE TABLE [tableName]
-- Find the constraintID after CONSTRAINT 'constraintID'
ALTER TABLE [tableName] DROP FOREIGN KEY constraintIDunique constraint mssql
USE AdventureWorks2012;
GO
CREATE TABLE Production.TransactionHistoryArchive4
(
TransactionID int NOT NULL,
CONSTRAINT AK_TransactionID UNIQUE(TransactionID)
);
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