How to describe all tables in the database through one statement in MySQL?-Mysql Tutorial-php.cn

How to describe all tables in the database through one statement in MySQL?

You can use INFORMATION_SCHEMA.COLUMNS to describe all tables in a database with a single statement. The syntax is as follows.

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

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Here I am using a database example with two tables.

The table names are as follows -

mytable
yourtable

Implement the above syntax for your database. The query is as follows -

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

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The following is the output describing the two tables in our database.

*************************** 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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