mysql怎樣查詢所有表和字段信息

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mysql查詢所有表和字段信息的方法：1、根據庫名獲取所有表的信息【information_schema.`TABLES`】；2、根據庫名獲取所有的字段信息【ORDINAL_POSITION AS '列的排列順序'】。

mysql查詢所有表和字段信息的方法：

1、根據庫名獲取所有表的信息

SELECT
    *
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = 'erp';

2、根據庫名獲取所有表名稱和表說明

SELECT
    TABLE_NAME,
    TABLE_COMMENT
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = 'erp';

view:

3、根據庫名獲取所有的字段信息

SELECT
    TABLE_SCHEMA AS '庫名',
    TABLE_NAME AS '表名',
    COLUMN_NAME AS '列名',
    ORDINAL_POSITION AS '列的排列順序',
    COLUMN_DEFAULT AS '默認值',
    IS_NULLABLE AS '是否為空',
    DATA_TYPE AS '數據類型',
    CHARACTER_MAXIMUM_LENGTH AS '字符最大長度',
    NUMERIC_PRECISION AS '數值精度(最大位數)',
    NUMERIC_SCALE AS '小數精度',
    COLUMN_TYPE AS 列類型,
    COLUMN_KEY 'KEY',
    EXTRA AS '額外說明',
    COLUMN_COMMENT AS '注釋'
FROM
    information_schema.`COLUMNS`
WHERE
    TABLE_SCHEMA = 'erp'
ORDER BY
    TABLE_NAME,
    ORDINAL_POSITION;

view:

4、根據庫名獲取所有的庫和表字段的基本信息

SELECT
    C.TABLE_SCHEMA AS '庫名',
    T.TABLE_NAME AS '表名',
    T.TABLE_COMMENT AS '表注釋',
    C.COLUMN_NAME AS '列名',
    C.COLUMN_COMMENT AS '列注釋',
    C.ORDINAL_POSITION AS '列的排列順序',
    C.COLUMN_DEFAULT AS '默認值',
    C.IS_NULLABLE AS '是否為空',
    C.DATA_TYPE AS '數據類型',
    C.CHARACTER_MAXIMUM_LENGTH AS '字符最大長度',
    C.NUMERIC_PRECISION AS '數值精度(最大位數)',
    C.NUMERIC_SCALE AS '小數精度',
    C.COLUMN_TYPE AS 列類型,
    C.COLUMN_KEY 'KEY',
    C.EXTRA AS '額外說明'
FROM
    information_schema.`TABLES` T
LEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAME
AND T.TABLE_SCHEMA = C.TABLE_SCHEMA
WHERE
    T.TABLE_SCHEMA = 'erp' 
ORDER BY
    C.TABLE_NAME,
    C.ORDINAL_POSITION;

view:

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