标签：dac update select log drop roo 改变 code ror
一 \G
作用：改变输出结果的显示方式，使输出按列显示。
注意：\G为大写字母，使用 \G 参数后，sql语句不加分隔符；。如加上，会报一下错误：
mysql> select * from mysql.user \G *************************** 1. row *************************** Host: localhost User: root Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 Select_priv: Y Insert_priv: Y Update_priv: Y Delete_priv: Y Create_priv: Y Drop_priv: Y Reload_priv: Y Shutdown_priv: Y Process_priv: Y
PS：
mysql> select * from mysql.user \G; *************************** 1. row *************************** Host: localhost User: root Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 Select_priv: Y Insert_priv: Y Update_priv: Y Delete_priv: Y Create_priv: Y Drop_priv: Y Reload_priv: Y Shutdown_priv: Y Process_priv: Y File_priv: Y Grant_priv: Y References_priv: Y Index_priv: Y Alter_priv: Y Show_db_priv: Y Super_priv: Y Create_tmp_table_priv: Y
ERROR:
No query specified
二 插入表格
两种操作的对比：
create操作，表格先前不存在
mysql> create table t1(x char(60),y char(16)) select host,user from mysql.user; Query OK, 11 rows affected (0.57 sec) Records: 11 Duplicates: 0 Warnings: 0 mysql> create table t2(host char(60),user char(16)) select host,user from mysql.user; Query OK, 11 rows affected (0.58 sec) Records: 11 Duplicates: 0 Warnings: 0 mysql> desc t1; +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | x | char(60) | YES | | NULL | | | y | char(16) | YES | | NULL | | | host | char(60) | NO | | | | | user | char(16) | NO | | | | +-------+----------+------+-----+---------+-------+ 4 rows in set (0.01 sec) mysql> desc t2; +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | host | char(60) | YES | | NULL | | | user | char(16) | YES | | NULL | | +-------+----------+------+-----+---------+-------+ 2 rows in set (0.01 sec)
mysql> create table t1(id int ,name char(10)); Query OK, 0 rows affected (0.30 sec) mysql> create table t2(id int ,name char(10)); Query OK, 0 rows affected (0.29 sec) mysql> insert t2 values -> (1,‘alex‘), -> (2,‘egon‘); Query OK, 2 rows affected (0.29 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> insert t1 values -> (1,‘wupeiqi‘); Query OK, 1 row affected (0.30 sec) mysql> insert t1 select id,name from t2; Query OK, 2 rows affected (0.32 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> select * from t1; +------+---------+ | id | name | +------+---------+ | 1 | wupeiqi | | 1 | alex | | 2 | egon | +------+---------+ 3 rows in set (0.00 sec)
select as 用法
mysql> create table t1(主机地址 char(40),用户名 char(20)) select host as 主机地址,user as 用户名 from mysql.user; Query OK, 11 rows affected (0.57 sec) Records: 11 Duplicates: 0 Warnings: 0 mysql> select * from t1; +--------------+-----------+ | 主机地址 | 用户名 | +--------------+-----------+ | % | alex | | % | egon | | % | egon1 | | % | yuanhao | | % | zuo | | % | zuo1 | | 127.0.0.1 | root | | ::1 | root | | localhost | | | localhost | root | | localhost | zuo | +--------------+-----------+ 11 rows in set (0.00 sec)
insert 操作 表格先前存在
mysql> create table t1(id int ,name char(10)); Query OK, 0 rows affected (0.30 sec) mysql> create table t2(id int ,name char(10)); Query OK, 0 rows affected (0.29 sec) mysql> insert t2 values -> (1,‘alex‘), -> (2,‘egon‘); Query OK, 2 rows affected (0.29 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> insert t1 values -> (1,‘wupeiqi‘); Query OK, 1 row affected (0.30 sec) mysql> insert t1 select id,name from t2; Query OK, 2 rows affected (0.32 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> select * from t1; +------+---------+ | id | name | +------+---------+ | 1 | wupeiqi | | 1 | alex | | 2 | egon | +------+---------+ 3 rows in set (0.00 sec)
标签：dac update select log drop roo 改变 code ror
原文地址：http://www.cnblogs.com/654321cc/p/7729914.html
