mysql怎样查询所有表和字段信息

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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 = 'erp';

2、根据库名获取所有表名称和表说明

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

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3、根据库名获取所有的字段信息

SELECT    TABLE_SCHEMA AS '库名',    TABLE_NAME AS '表名',    COLUMN_NAME AS '列名',    ORDINAL_POSITION AS '列的排列顺序',    COLUMN_DEFAULT AS '默认值',    IS_NULLABLE AS '是否为空',    DATA_TYPE AS '数据类型',    CHARACTER_MAXIMUM_LENGTH AS '字符最大长度',    NUMERIC_PRECISION AS '数值精度(最大位数)',    NUMERIC_SCALE AS '小数精度',    COLUMN_TYPE AS 列类型,    COLUMN_KEY 'KEY',    EXTRA AS '额外说明',    COLUMN_COMMENT AS '注释'FROM    information_schema.`COLUMNS`WHERE    TABLE_SCHEMA = 'erp'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 '库名',    T.TABLE_NAME AS '表名',    T.TABLE_COMMENT AS '表注释',    C.COLUMN_NAME AS '列名',    C.COLUMN_COMMENT AS '列注释',    C.ORDINAL_POSITION AS '列的排列顺序',    C.COLUMN_DEFAULT AS '默认值',    C.IS_NULLABLE AS '是否为空',    C.DATA_TYPE AS '数据类型',    C.CHARACTER_MAXIMUM_LENGTH AS '字符最大长度',    C.NUMERIC_PRECISION AS '数值精度(最大位数)',    C.NUMERIC_SCALE AS '小数精度',    C.COLUMN_TYPE AS 列类型,    C.COLUMN_KEY 'KEY',    C.EXTRA AS '额外说明'FROM    information_schema.`TABLES` TLEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAMEAND T.TABLE_SCHEMA = C.TABLE_SCHEMAWHERE    T.TABLE_SCHEMA = 'erp' ORDER BY    C.TABLE_NAME,    C.ORDINAL_POSITION;

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