security-admin/db/sqlserver/patches/023-add-unique-constraint-on-table-x_user.sql

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IF EXISTS(select * from INFORMATION_SCHEMA.columns where table_name = 'x_user' and column_name = 'user_name')
BEGIN
	IF NOT EXISTS(select * from INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE where table_name='x_user' and column_name='user_name' and constraint_name = 'x_user$x_user_UK_user_name')
    BEGIN
	    IF NOT EXISTS(select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where table_name='x_user' and constraint_name = 'x_user$x_user_UK_user_name' and CONSTRAINT_TYPE='UNIQUE')
	    BEGIN
	        ALTER TABLE [dbo].[x_user] ALTER COLUMN [user_name] [varchar](767) NOT NULL;
	        ALTER TABLE [dbo].[x_user] ADD CONSTRAINT [x_user$x_user_UK_user_name] UNIQUE ([user_name]);
	    END
    END
END
GO
exit