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mysql如何查询所有表和字段信息

coldplay.xixi

发布： 2020-10-29 16:22:55

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mysql查询所有表和字段信息的方法：1、根据库名获取所有表的信息【information_schema.`TABLES`】；2、根据库名获取所有的字段信息【ORDINAL_POSITION AS '列的排列顺序'】。

mysql如何查询所有表和字段信息

mysql查询所有表和字段信息的方法：

1、根据库名获取所有表的信息

SELECT
    *
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = &#39;erp&#39;;

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2、根据库名获取所有表名称和表说明

SELECT
    TABLE_NAME,
    TABLE_COMMENT
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = &#39;erp&#39;;

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3、根据库名获取所有的字段信息

SELECT
    TABLE_SCHEMA AS &#39;库名&#39;,
    TABLE_NAME AS &#39;表名&#39;,
    COLUMN_NAME AS &#39;列名&#39;,
    ORDINAL_POSITION AS &#39;列的排列顺序&#39;,
    COLUMN_DEFAULT AS &#39;默认值&#39;,
    IS_NULLABLE AS &#39;是否为空&#39;,
    DATA_TYPE AS &#39;数据类型&#39;,
    CHARACTER_MAXIMUM_LENGTH AS &#39;字符最大长度&#39;,
    NUMERIC_PRECISION AS &#39;数值精度(最大位数)&#39;,
    NUMERIC_SCALE AS &#39;小数精度&#39;,
    COLUMN_TYPE AS 列类型,
    COLUMN_KEY &#39;KEY&#39;,
    EXTRA AS &#39;额外说明&#39;,
    COLUMN_COMMENT AS &#39;注释&#39;
FROM
    information_schema.`COLUMNS`
WHERE
    TABLE_SCHEMA = &#39;erp&#39;
ORDER BY
    TABLE_NAME,
    ORDINAL_POSITION;

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4、根据库名获取所有的库和表字段的基本信息

SELECT
    C.TABLE_SCHEMA AS &#39;库名&#39;,
    T.TABLE_NAME AS &#39;表名&#39;,
    T.TABLE_COMMENT AS &#39;表注释&#39;,
    C.COLUMN_NAME AS &#39;列名&#39;,
    C.COLUMN_COMMENT AS &#39;列注释&#39;,
    C.ORDINAL_POSITION AS &#39;列的排列顺序&#39;,
    C.COLUMN_DEFAULT AS &#39;默认值&#39;,
    C.IS_NULLABLE AS &#39;是否为空&#39;,
    C.DATA_TYPE AS &#39;数据类型&#39;,
    C.CHARACTER_MAXIMUM_LENGTH AS &#39;字符最大长度&#39;,
    C.NUMERIC_PRECISION AS &#39;数值精度(最大位数)&#39;,
    C.NUMERIC_SCALE AS &#39;小数精度&#39;,
    C.COLUMN_TYPE AS 列类型,
    C.COLUMN_KEY &#39;KEY&#39;,
    C.EXTRA AS &#39;额外说明&#39;
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 = &#39;erp&#39; 
ORDER BY
    C.TABLE_NAME,
    C.ORDINAL_POSITION;

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