sql语句如何查询一个表中某两个字段的相同数据?

查询一个表中某两个字段的相同数据代码是：Select Name,ID From A group by Name,ID having count (*)>1。

结构化查询语言(Structured Query Language)简称SQL，结构化查询语言是一种数据库查询和程序设计语言，用于存取数据以及查询、更新和管理关系数据库系统;

sql 语句就是对数据库进行操作的一种语言。

sql="select * from 数据表 where字段名=字段值 order by字段名[desc]"（按某个字段值降序排列，默认升序ASC）；

sql="select * from 数据表 where字段名like '%字段值%' order by 字段名 [desc]"；

sql="select top 10 * from 数据表 where字段名=字段值 order by 字段名 [desc]"；

sql="select top 10 * from 数据表 order by 字段名 [desc]"；

sql="select * from 数据表 where字段名in ('值1','值2','值3')"；

sql="select * from 数据表 where字段名between 值1 and 值2"。

sql语句：

更新:update table1 set field1=value1 where 范围；

查找:select * from table1 where field1 like '%value1%' (所有包含'value1'这个模式的字符串)；

排序:select * from table1 order by field1,field2 [desc]；

求和:select sum(field1) as sumvalue from table1；

平均:select avg(field1) as avgvalue from table1；

最大:select max(field1) as maxvalue from table1；

最小:select min(field1) as minvalue from table1[separator]。

除重
select distinct A.ID AS AID,A.Name AS AName,B.ID AS BID,B.Name AS BName from A inner join B on(A.Name=B.Name and A.ID=B.ID)
不除重
select A.ID AS AID,A.Name AS AName,B.ID AS BID,B.Name AS BName from A inner join B on(A.Name=B.Name and A.ID=B.ID)

select * from A
inner join B on A.Name = B.Name and A.ID = B.ID
where A.Name = '张三' and A.ID = '008'
内连接即可

Select Name,ID From A group by Name,ID having count (*)>1

select name,id,count(*) from a group by name,id