检查MySQL中是否存在表？

为了检查MySQL中是否存在表，可以使用INFORMATION_SCHEMA.TABLES。让我们首先创建一个表-

mysql> create table Client_information
   -> (
   -> Id int,
   -> Name varchar(10)
   -> );

以下是使用insert命令在表中插入一些记录的查询-

mysql> insert into Client_information values(1,'Larry');

mysql> insert into Client_information values(2,'Mike');

mysql> insert into Client_information values(3,'Sam');

以下是使用select语句显示表中所有记录的查询-

mysql> select * from Client_information;

这将产生以下输出-

+------+-------+
| Id   | Name  |
+------+-------+
| 1    | Larry |
| 2    | Mike  |
| 3    | Sam   |
+------+-------+
3 rows in set (0.00 sec)

以下是检查表是否存在于MySQL中的查询-

mysql> select * from information_schema.tables where table_name='Client_information';

在输出状态之后，表“ Client_information”存在-

+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
| TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME         | TABLE_TYPE | ENGINE | VERSION | ROW_FORMAT | TABLE_ROWS | AVG_ROW_LENGTH | DATA_LENGTH | MAX_DATA_LENGTH | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME | UPDATE_TIME | CHECK_TIME | TABLE_COLLATION | CHECKSUM | CREATE_OPTIONS | TABLE_COMMENT |
+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
| def           | sample       | client_information | BASE TABLE | InnoDB | 10      | Dynamic    | 4          | 4096           | 16384       | 0 | 0 | 0 | NULL | 2019-03-11 20:02:40 | NULL | NULL | utf8_general_ci | NULL | | |
| def           | test         | client_information | BASE TABLE | InnoDB | 10      | Dynamic    | 3          | 5461           | 16384       | 0 | 0 | 0 | NULL | 2019-04-03 02:28:31 | 2019-04-03 02:29:00 | NULL | utf8mb4_0900_ai_ci | NULL | | |
+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
2 rows in set (0.13 sec)