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【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';

SELECT     TABLE_NAME,     TABLE_COMMENT FROM     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` 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;

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