一.select
显示当前日期和时间
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mysql> select now();
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+---------------------+
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| now() |
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+---------------------+
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|2019-06-05 13:46:20|
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+---------------------+
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1 row in set(0.00 sec)
显示当前日期
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mysql> select curdate();
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+------------+
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| curdate() |
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+------------+
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|2019-06-05|
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+------------+
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1 row in set(0.04 sec)
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显示当前时间
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mysql> select curtime();
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+-----------+
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| curtime() |
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+-----------+
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|13:48:15|
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+-----------+
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1 row in set(0.00 sec)
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显示当前所在数据库
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mysql> use test_db;
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Reading table information for completion of table and column names
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You can turn off this feature to get a quicker startup with -A
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Database changed
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mysql>select data base();
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+------------+
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| database() |
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+------------+
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| test_db |
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+------------+
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1 row in set(0.00 sec)
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显示Mysql版本
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mysql> select version();
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+-----------+
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| version() |
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+-----------+
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|5.7.16|
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+-----------+
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1 row in set(0.00 sec)
显示当前用户
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mysql> select user();
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+----------------+
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| user() |
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+----------------+
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| root@localhost |
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+----------------+
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1 row in set(0.00 sec)
二.show
show variables;显示变量
show global variables;显示全局变量
show global variables like "%version%";显示版本信息
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mysql> show global variables like "%version%";
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+-------------------------+------------------------------+
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| Variable_name | Value |
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+-------------------------+------------------------------+
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| innodb_version |5.7.16 |
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| protocol_version |10 |
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| slave_type_conversions | |
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| tls_version | TLSv1, TLSv1.1 |
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| version |5.7.16|
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| version_comment |MySQL CommunityServer(GPL) |
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| version_compile_machine | x86_64 |
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| version_compile_os | Linux |
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+-------------------------+------------------------------+
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8 rows in set(0.00 sec)
show variables like "%storage_engine%";显示默认的存储引擎
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mysql> show variables like"%storage_engine%";
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+----------------------------------+--------+
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| Variable_name | Value |
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+----------------------------------+--------+
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| default_storage_engine | InnoDB |
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| default_tmp_storage_engine | InnoDB |
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| disabled_storage_engines | |
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| internal_tmp_disk_storage_engine | InnoDB |
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+----------------------------------+--------+
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4 rows in set(0.00 sec)
End.
作者:苦逼运维
来源:博客园
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