显示mysql innodb数据库中每个表的表名+记录数

Question

如何列出当前数据库中的所有表，以及该表的行数。

换句话说，你能想出一个查询来在 mysql 中提出这样的事情吗？

+------------------------++------------------------+
| Tables_in_database     |  Number of rows         |
+------------------------++------------------------+
| database 1             |   1000                  |
| database 2             |   1500                  |
+------------------------++------------------------+

欢迎使用不同的方法。

Answer 1

我有一个非常积极的方法使用蛮力动态 SQL

SET group_concat_max_len = 1024 * 1024 * 100;
SELECT CONCAT('SELECT * FROM (',GROUP_CONCAT(CONCAT('SELECT ',QUOTE(tb),' Tables_in_database,
COUNT(1) "Number of Rows" FROM ',db,'.',tb) SEPARATOR ' UNION '),') A;')
INTO @sql FROM (SELECT table_schema db,table_name tb
FROM information_schema.tables WHERE table_schema = DATABASE()) A;
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;

示例：在我的测试数据库中，我得到了这个

mysql> use test
Database changed
mysql> SET group_concat_max_len = 1024 * 1024 * 100;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT CONCAT('SELECT * FROM (',GROUP_CONCAT(CONCAT('SELECT ',QUOTE(tb),' Tables_in_database,
    '> COUNT(1) "Number of Rows" FROM ',db,'.',tb) SEPARATOR ' UNION '),') A;')
    -> INTO @sql FROM (SELECT table_schema db,table_name tb
    -> FROM information_schema.tables WHERE table_schema = DATABASE()) A;
Query OK, 1 row affected (0.00 sec)

mysql> PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

+--------------------+----------------+
| Tables_in_database | Number of Rows |
+--------------------+----------------+
| biblio             |              3 |
| biblio_old         |              7 |
| dep                |              5 |
| e                  |             14 |
| emp                |              4 |
| fruit              |             12 |
| fruit_outoforder   |             12 |
| nums_composite     |              0 |
| nuoji              |              4 |
| prod               |              3 |
| prodcat            |              6 |
| test2              |              9 |
| worktable          |              5 |
| yoshi_scores       |             24 |
+--------------------+----------------+
14 rows in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>

试一试 ！！！

CAVEAT ：如果所有表都是 MyISAM，这将发生得非常快。如果所有表都是 InnoDB，则每个表都会被统计。对于非常大的 InnoDB 表，这可能是残酷和无情的。

Answer 2

在没有动态查询的情况下尝试以下查询

SELECT Table_name AS TablesInDatabase ,table_rows AS NumberOfRows 
FROM information_schema.tables 
WHERE Table_schema=DATABASE();