MySQL5.7中union all用法的黑科技的图文代码介绍

+----+-------------+-------+------------+-------+---------------+--------+---------+------+------+----------+-------------+ 2 rows in set, 1 warning (0.00 sec)

可以看出，在MySQL5.7版本中，执行结果如下图所示：

Part2:MariaDB10.1.16

[root@HE3 ~]# /usr/local/mariadb/bin/mysql -uroot -S /tmp/mariadb.sock 
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 7
Server version: 10.1.16-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
MariaDB [helei]> explain (select id from helei order by id) union all (select id from t where id=0 order by id);
+------+-------------+-------+-------+---------------+--------+---------+------+------+-------------+

关键词：MySQL5.7中union all用法的黑科技的图文代码介绍