The delete and update commands are mutually exclusive for the when matched clause, which means that only one of them can be specified in a merge statement at a time.
对于子句 when matched，delete 与 update 命令互斥，这意味着在 merge 语句中同时只能指定两者之一。
The square-shaped middle part of the main frame is matched mutually with an internal telescoping rod (square) to hold the screws to prevent the screws from rotating.
主架中部是正方形的，和内部的伸缩杆(正方形)相互配合，顶住螺丝防止其旋转。
应用推荐