INFORMATION_SCHEMA.COLUMNS ব্যবহার করে একক স্টেটমেন্টে ডেটাবেসের সব টেবিল ডেসক্রাইব করা যায়। সিনট্যাক্স:
SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'yourDatabaseName'\G
এখানে আমি 'sample' ডেটাবেস ব্যবহার করছি যেখানে দুটি টেবিল আছে:
- mytable
- yourtable
আপনার ডেটাবেসের জন্য উপরের সিনট্যাক্স প্রয়োগ করি:
mysql> SELECT * FROM information_schema.columns WHERE table_schema = 'sample'\G
আমাদের ডেটাবেসের দুটি টেবিল ডেসক্রাইব করার আউটপুট:
*************************** 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)
