abstract：#增 INSERT `user` VALUES (null,'a1',0,34,'a1@php.cn',sha1(123456),1,1550302697); #查 SELECT `name`,`sex`,`age`,`email` FROM `user` WHERE `id`=3 #改
#增 INSERT `user` VALUES (null,'a1',0,34,'a1@php.cn',sha1(123456),1,1550302697); #查 SELECT `name`,`sex`,`age`,`email` FROM `user` WHERE `id`=3 #改 UPDATE `user` SET `age`=66 WHERE `id`=3 #删 DELETE FROM `user` WHERE `id`=3
Correcting teacher：天蓬老师Correction time：2019-02-16 16:10:06
Teacher's summary：最常用的是这个几个, 基本最复杂的是: select , 多做些练习