Who are these scripts for? You need to troubleshoot performance problems with SQL Server, and you need to do it now. You don't have time to track down a bunch of DMVs, figure out Extended Events, ...

column_name2 data_type constraint... column_nameN data_type constraint; 下面在Employee表格中添加一个类型为varchar尺寸为 500 的新栏Address。 ALTER TABLE dbo.Employee Add Address varchar(500) NOT NULL; 下面给Employee表增加三列。