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获取MySQL表中的字段数？

2024-04-30 18:34:04 403

要显示MySQL中的字段数，请使用COUNT（*）。以下是语法-

select COUNT(*) AS anyAliasName
from INFORMATION_SCHEMA.COLUMNS
where table_name = yourTableName AND
TABLE_SCHEMA = yourDatabaseName;

让我们首先创建一个表-

mysql> create table DemoTable794 (
   ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   ClientName varchar(100),
   ClientAge int,
   ClientCountryName varchar(100)
);

以下是获取MySQL中字段数的查询-

mysql> select COUNT(*) AS TOTAL_NUMBER_OF_COLUMNS
   from INFORMATION_SCHEMA.COLUMNS
   where table_name = 'DemoTable794' AND
   TABLE_SCHEMA = 'web';

这将产生以下输出-

+-------------------------+
| TOTAL_NUMBER_OF_COLUMNS |
+-------------------------+
| 4                       |
+-------------------------+
1 row in set (0.00 sec)

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获取MySQL表中的字段数？

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