开发者社区> 问答> 正文

Nested Subquery and Correlated Subquery in SQL?

What is the difference between Nested Subquery and Correlated Subquery?

展开
收起
1780169608831412 2021-10-16 14:34:01 572 0
1 条回答
写回答
取消 提交回答
  • 网络规划设计师、敏捷专家、CISP、ITSS服务经理、ACA全科目、ACP4项、ACE、CBP、CDSP、CZTP等。拥有 PRINCE2 Foundation/Practitioner、CCSK、ITIL、ISO27001、PMP等多项国际认证。 专利5+、期刊10+、知识产权师。核心期刊审稿人。

    Subquery within another subquery is called Nested Subquery. If the output of a subquery depends on column values of the parent query table then the query is called Correlated Subquery.

    SELECT adminid(SELEC Firstname+' '+Lastname  FROM Employee WHERE
     empid=emp. adminid)AS EmpAdminId FROM Employee;
    
    

    The result of the query is the details of an employee from the Employee table.

    2021-10-16 15:28:51
    赞同 1 展开评论 打赏
问答分类:
SQL
问答标签:
问答地址:
问答排行榜
最热
最新

相关电子书

更多
SQL Server在电子商务中的应用与实践 立即下载
GeoMesa on Spark SQL 立即下载
原生SQL on Hadoop引擎- Apache HAWQ 2.x最新技术解密malili 立即下载