mysql中left join on后面and和where条件查询的差异
mysql中,运算符是有优先级的.举个例子create table A(id int);INSERT INTO A VALUES(1);INSERT INTO A VALUES(2);INSERT INTO A VALUES(3);create table B(id int);INSERT INTO B VALUES(1);INSERT INTO B VALUES(2)
原创
2017-03-14 18:48:49 ·
19583 阅读 ·
0 评论