MySQL 如何在MySQL中通过一条语句描述数据库中的所有表？

您可以使用INFORMATION_SCHEMA.COLUMNS通过一条语句描述数据库中的所有表。语法如下。

SELECT *FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA=’yourDatabaseName’\G

在这里，我使用了我的数据库样本，其中有两个表。

表名如下 −

• mytable
• yourtable

将以上语法用于您的数据库。查询如下 −

mysql> select * FROM information_schema.columns WHERE table_schema = 'sample'\G

以下是输出，描述了我们数据库中的两个表。

*************************** 1. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: sample
TABLE_NAME: mytable
COLUMN_NAME: id
ORDINAL_POSITION: 1
COLUMN_DEFAULT: NULL
IS_NULLABLE: YES
DATA_TYPE: int
CHARACTER_MAXIMUM_LENGTH: NULL
CHARACTER_OCTET_LENGTH: NULL
NUMERIC_PRECISION: 10
NUMERIC_SCALE: 0
DATETIME_PRECISION: NULL
CHARACTER_SET_NAME: NULL
COLLATION_NAME: NULL
COLUMN_TYPE: int(11)
COLUMN_KEY:
EXTRA:
PRIVILEGES: select,insert,update,references
COLUMN_COMMENT:
GENERATION_EXPRESSION:
SRS_ID: NULL
*************************** 2. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: sample
TABLE_NAME: mytable
COLUMN_NAME: Name
ORDINAL_POSITION: 2
COLUMN_DEFAULT: NULL
IS_NULLABLE: YES
DATA_TYPE: varchar
CHARACTER_MAXIMUM_LENGTH: 100
CHARACTER_OCTET_LENGTH: 400
NUMERIC_PRECISION: NULL
NUMERIC_SCALE: NULL
DATETIME_PRECISION: NULL
CHARACTER_SET_NAME: utf8mb4
COLLATION_NAME: utf8mb4_0900_ai_ci
COLUMN_TYPE: varchar(100)
COLUMN_KEY:
EXTRA:
PRIVILEGES: select,insert,update,references
COLUMN_COMMENT:
GENERATION_EXPRESSION:
SRS_ID: NULL
*************************** 3. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: sample
TABLE_NAME: yourtable
COLUMN_NAME: id
ORDINAL_POSITION: 1
COLUMN_DEFAULT: NULL
IS_NULLABLE: YES
DATA_TYPE: int
CHARACTER_MAXIMUM_LENGTH: NULL
CHARACTER_OCTET_LENGTH: NULL
NUMERIC_PRECISION: 10
NUMERIC_SCALE: 0
DATETIME_PRECISION: NULL
CHARACTER_SET_NAME: NULL
COLLATION_NAME: NULL
COLUMN_TYPE: int(11)
COLUMN_KEY:
EXTRA:
PRIVILEGES: select,insert,update,references
COLUMN_COMMENT:
GENERATION_EXPRESSION:
SRS_ID: NULL
*************************** 4. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: sample
TABLE_NAME: yourtable
COLUMN_NAME: YourName
ORDINAL_POSITION: 2
COLUMN_DEFAULT: NULL
IS_NULLABLE: YES
DATA_TYPE: varchar
CHARACTER_MAXIMUM_LENGTH: 100
CHARACTER_OCTET_LENGTH: 400
NUMERIC_PRECISION: NULL
NUMERIC_SCALE: NULL
DATETIME_PRECISION: NULL
CHARACTER_SET_NAME: utf8mb4
COLLATION_NAME: utf8mb4_0900_ai_ci
COLUMN_TYPE: varchar(100)
COLUMN_KEY:
EXTRA:
PRIVILEGES: select,insert,update,references
COLUMN_COMMENT:
GENERATION_EXPRESSION:
SRS_ID: NULL
4 rows in set (0.00 sec)

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