mysql基础知识--状态查询

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'''
mysql> status;
--------------
mysql
Ver 14.14 Distrib 5.6.41, for Win64 (x86_64)
Connection id:
2
Current database:
Current user:
root@localhost
SSL:
Not in use
Using delimiter:
;
Server version:
5.6.41 MySQL Community Server (GPL)
Protocol version:
10
Connection:
localhost via TCP/IP
Server characterset:
latin1
Db
characterset:
latin1
Client characterset:
gbk
Conn.
characterset:
gbk
TCP port:
3306
Uptime:
5 min 5 sec
Threads: 1
Questions: 9
Slow queries: 0
Opens: 67
Flush tables: 1
Open tabl
es: 60
Queries per second avg: 0.029
--------------
'''

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'''
mysql> select user();
+----------------+
| user()
|
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)
'''

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'''
mysql> select current_time();
+----------------+
| current_time() |
+----------------+
| 17:48:28
|
+----------------+
1 row in set (0.00 sec)
mysql> select current_date();
+----------------+
| current_date() |
+----------------+
| 2018-10-17
|
+----------------+
1 row in set (0.00 sec)
mysql> select current_timestamp();
+---------------------+
| current_timestamp() |
+---------------------+
| 2018-10-17 17:48:54 |
+---------------------+
1 row in set (0.00 sec)
'''

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'''
mysql> show databases;
+--------------------+
| Database
|
+--------------------+
| information_schema |
| mysql
|
| performance_schema |
| test
|
+--------------------+
4 rows in set (0.00 sec)
'''

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'''
mysql> select database();
+------------+
| database() |
+------------+
| NULL
|
+------------+
1 row in set (0.00 sec)
'''