mysql 查询表注释/字段注释

Select table_name 表名,TABLE_COMMENT 表注释 from INFORMATION_SCHEMA.TABLES Where table_schema = 'mstps' ##数据库名
AND table_name LIKE 'ms_staff';##表名
Select COLUMN_NAME 列名, COLUMN_TYPE 字段类型, COLUMN_COMMENT 字段注释
from INFORMATION_SCHEMA.COLUMNS
Where table_name = 'ms_staff'##表名
AND table_schema = 'mstps';##数据库名
##AND column_name LIKE 'c_name'##字段名

SELECT  COLUMN_NAME as '列名',COLUMN_COMMENT,DATA_TYPE as '字段类型' ,COLUMN_TYPE as '长度加类型' FROM information_schema.`COLUMNS` where TABLE_NAME like 'ms_staff';

select a.table_name , a.table_comment from (SELECT * FROM INFORMATION_SCHEMA.TABLES Where table_schema = 'mstps') a WHERE (a.TABLE_COMMENT) IN(
    Select b.TABLE_COMMENT FROM (SELECT * FROM INFORMATION_SCHEMA.TABLES Where table_schema = 'mstps') b GROUP BY (b.TABLE_COMMENT)
    HAVING COUNT(*)>1
);   ##查询单个数据库所有重复的数据
Select a.table_name dBname,a.TABLE_COMMENT sheetNotes from INFORMATION_SCHEMA.TABLES a Where table_schema = 'mstps' and a.TABLE_COMMENT LIKE CONCAT('%','购物车','%');##查询重复数据为'xx'的行
select * from xi a where (a.username) in  (select username from xi group by username  having count(*) > 1); ##查询重复数据