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

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_COMMENT
FROM
information_schema.`TABLES`
WHERE
TABLE_SCHEMA = 'erp';

view:

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;

view:

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;

view:

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