mysql如何查询所有表和字段信息

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;