1、取出刚刚插入(删除)的数据SELECT 字段名 FROM INSERTED(DELETED) 2、对于UPDATE实际上是先DELETE然后再INSERT所以如果想得到UPDATE前后的数据值,应该先从DELETED取出,然后从INSERTED取出; 3、IF UPDATE(列名)可以判断更新或插入哪一个字段的值; 4、@@ROWCOUNT可以判断上一行查询操作得到的列数; 5、给变量赋值用SET @ZQB = 13; 6、察看是否有符合条件的记录IF EXISTS (SELECT name FROM sysobjects WHERE name = 'reminder' AND type = 'TR'); 7、定义游标,如下: DECLARE c1 CURSOR FOR SELECT emp_mgr.emp FROM emp_mgr, inserted WHERE emp_mgr.emp = inserted.mgr
OPEN c1 FETCH NEXT FROM c1 INTO @e--从游标中取出数据 WHILE @@fetch_status = 0--判断是否到最后 BEGIN UPDATE emp_mgr SET emp_mgr.NoOfReports = emp_mgr.NoOfReports 1 -- Add 1 for newly WHERE emp_mgr.emp = @e -- added employee.
FETCH NEXT FROM c1 INTO @e END CLOSE c1 DEALLOCATE c1--删除游标引用