mysql数据表结构查询

select * from (
select 
   '表名',
     '字段名',
     '字段类型',
     '默认值',
     '是否可空',
     '注释',
     '主键'
UNION 
(
SELECT
    a.TABLE_NAME '表名',
    a.COLUMN_NAME '字段名',
    a.COLUMN_TYPE '字段类型',
    a.COLUMN_DEFAULT '默认值',
    a.IS_NULLABLE '是否可空',
    a.COLUMN_COMMENT '注释',
    a.COLUMN_KEY '主键'
FROM
    information_schema. COLUMNS a
WHERE
    a.TABLE_SCHEMA = 'bbt' 
AND a.TABLE_NAME = 'tab_operation_data_collect'
ORDER BY
    a.TABLE_NAME,
    a.ORDINAL_POSITION
)
) b;

#查询字段在哪些表中存在
SELECT
    a.TABLE_NAME '表名',
    a.COLUMN_NAME '字段名',
    a.COLUMN_TYPE '字段类型',
    a.COLUMN_DEFAULT '默认值',
    a.IS_NULLABLE '是否可空',
    a.COLUMN_COMMENT '注释',
    a.COLUMN_KEY '主键'
FROM
    information_schema. COLUMNS a
WHERE
    a.TABLE_SCHEMA = 'bbt' 
-- AND a.TABLE_NAME = 't_gateway_log'
and COLUMN_NAME like '%product_type%'
-- and COLUMN_NAME like '%_policy_id%'
ORDER BY
    a.TABLE_NAME,
    a.ORDINAL_POSITION;

#查询表主键
SELECT DISTINCT
    table_name
FROM
    information_schema.COLUMNS
WHERE
    TABLE_SCHEMA = 'batchjob'
AND table_name NOT IN (
    SELECT DISTINCT
        table_name
    FROM
        information_schema.COLUMNS
    WHERE
        TABLE_SCHEMA = 'bbt'
    AND (
        column_key = 'PRI'
        OR column_key = 'UNI'
    )
);