MySQL查询来查找在最近一小时内修改过的表？

您可以借助INFORMATION_SCHEMA.TABLES来实现。使用带有间隔的date_sub()。语法如下-

SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE DATE_SUB(NOW(), INTERVAL -1HOUR) < ‘UPDATE_TIME’;

现在您可以检查上面的语法。这是查找最近一小时修改的表的查询-

mysql> select table_name from `INFORMATION_SCHEMA`.`TABLES`
-> WHERE
-> DATE_SUB(NOW(), INTERVAL 1 HOUR) < `UPDATE_TIME`;

输出结果

+---------------------+
| TABLE_NAME          |
+---------------------+
| innodb_table_stats  |
| innodb_index_stats  |
| employeeinformation |
+---------------------+
3 rows in set (0.37 sec)

上面的查询仅选择表名。如果您需要表架构，表类型等信息，则需要使用以下查询。查询显示最近一小时修改的表-

mysql> SELECT *
-> FROM `INFORMATION_SCHEMA`.`TABLES`
-> WHERE
-> DATE_SUB(NOW(), INTERVAL 1 HOUR) < `UPDATE_TIME`;

以下是显示最近一小时修改的表信息的输出-

+---------------+--------------+---------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+---------------------------------------+---------------+
| 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           | mysql        | innodb_table_stats  | BASE TABLE | InnoDB | 10      | Dynamic    | 449        | 145            | 65536       | 0               | 0            | 4194304   | NULL | 2018-09-22 20:37:26 | 2018-12-24 15:13:41 | NULL | utf8_bin | NULL |
row_format=DYNAMIC stats_persistent=0 | |
| def           | mysql        | innodb_index_stats  | BASE TABLE | InnoDB | 10      | Dynamic    | 1413       | 243            | 344064      | 0               | 0            | 4194304   | NULL | 2018-09-22 20:37:26 | 2018-12-24 15:13:41 | NULL | utf8_bin | NULL |
row_format=DYNAMIC stats_persistent=0 | |
| def           | test         | employeeinformation | BASE TABLE | InnoDB | 10      | Dynamic    | 6          | 2730           | 16384       | 0               | 0            | 0         | NULL | 2018-12-24 15:12:04 | 2018-12-24 15:14:00 | NULL | utf8mb4_0900_ai_ci | NULL | |
|
+---------------+--------------+---------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+---------------------------------------+---------------+
3 rows in set (43.72 sec)