Question

我正在增加我拥有的表的数量，我有时好奇只是做一个快速的命令行查询来计算我的数据库中的表数。那可能吗？如果是，查询是什么？

Answer 1

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

Source

这是我的：

USE databasename; 
SHOW TABLES; 
SELECT FOUND_ROWS();

Answer 2

如果您想要计算所有数据库和摘要，请尝试以下方法：

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;

以下是一个示例运行：

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)

试一试!!!

Answer 3

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

Answer 4

这将为您提供mysql中所有数据库的名称和表计数

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

Answer 5

要计算表数，请执行以下操作：

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

有时容易做的事情会起作用。

Answer 6

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

Answer 7

可能有多种方法来计算数据库的表。我最喜欢的是：

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

Answer 8

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';

Answer 9

来自命令行：

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

在上面的示例中，root是用户名和密码，托管在localhost上。

Answer 10

SELECT COUNT(*) FROM information_schema.tables

Answer 11

mysql>显示表;

它将显示表的名称，然后显示表的计数。

source

Answer 12

希望这会有所帮助，并且只返回数据库中的表数

Use database;

SELECT COUNT(*) FROM sys.tables;

查询以计算我在MySQL中拥有的表的数量

12 个答案: