查询以计数我在MySQL中拥有的表数

我正在增加表的数量，有时我很好奇，只是想做一个快速的命令行查询来计算数据库中表的数量。那可能吗？如果是这样，查询是什么？

SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'dbName';

资源

这是我的：

USE databasename; 
SHOW TABLES; 
SELECT FOUND_ROWS();

如果您想计算所有数据库以及摘要，请尝试以下操作：

SELECT IFNULL(table_schema,'Total') "Database",TableCount 
FROM (SELECT COUNT(1) TableCount,table_schema 
      FROM information_schema.tables 
      WHERE table_schema NOT IN ('information_schema','mysql') 
      GROUP BY table_schema WITH ROLLUP) A;

这是一个示例运行：

mysql> SELECT IFNULL(table_schema,'Total') "Database",TableCount
    -> FROM (SELECT COUNT(1) TableCount,table_schema
    ->       FROM information_schema.tables
    ->       WHERE table_schema NOT IN ('information_schema','mysql')
    ->       GROUP BY table_schema WITH ROLLUP) A;
+--------------------+------------+
| Database           | TableCount |
+--------------------+------------+
| performance_schema |         17 |
| Total              |         17 |
+--------------------+------------+
2 rows in set (0.29 sec)

试试看 ！！！

SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'dbo' and TABLE_TYPE='BASE TABLE'

这将为您提供mysql中所有数据库的名称和表数

SELECT TABLE_SCHEMA,COUNT(*) FROM information_schema.tables group by TABLE_SCHEMA;

要计算表数，只需执行以下操作：

USE your_db_name;    -- set database
SHOW TABLES;         -- tables lists
SELECT FOUND_ROWS(); -- number of tables

有时简单的事情会起作用。

SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'database_name';

计数数据库表的方法可能有多种。我最喜欢的是：

SELECT
    COUNT(*)
FROM
    `information_schema`.`tables`
WHERE
    `table_schema` = 'my_database_name'
;

select name, count(*) from DBS, TBLS 
where DBS.DB_ID = TBLS.DB_ID 
group by NAME into outfile '/tmp/QueryOut1.csv' 
fields terminated by ',' lines terminated by '\n';

从命令行：

mysql -uroot -proot  -e "select count(*) from 
information_schema.tables where table_schema = 'database_name';"

在上面的示例中，root是username和password，托管在localhost上。

SELECT COUNT(*) FROM information_schema.tables

mysql>显示表格；

它将显示表的名称，然后显示表的计数。

资源

希望这会有所帮助，并且仅返回数据库中的表数

Use database;

SELECT COUNT(*) FROM sys.tables;