javaEEday07-DML-SQL-Delete

2026-10-11 11:30:49 +08:00
parent eea26bafd0
commit 879801d756
1 changed files with 9 additions and 1 deletions
@@ -49,4 +49,12 @@ values
 update tb_emp set name = '张四' where id = 1;
 update tb_emp set name = '张四' ;
 -- 2. 将 tb_emp 表的所有员工的入职日期更新为 '2010-01-01'
-update tb_emp set entrydate='2010-01-01',update_time=now();
+update tb_emp set entrydate='2010-01-01',update_time=now();
+
+
+-- DML : 删除数据 - delete
+-- 1. 删除 tb_emp 表中 ID为1的员工
+delete from tb_emp where id = 1;
+
+-- 2. 删除 tb_emp 表中的所有员工
+delete from tb_emp;