我在SQL Server中有以下查询: UPDATE SET FROM LEFTJOIN @TableIndxRent AS idx ON result.IndxId = idx.IndxId
AND result.ActiveDate =idx.IndxDate; 我需要在PostgreSQL中使用相同的值,但它会用相同的值(NUL
我似乎找不到任何文档清楚地阐述某些update-join语句在PostgreSQL中是如何工作的。假设数据库中有三个表:professors、classes和classrooms。这是我感兴趣的命令: UPDATE classes c SET year = 2JOIN professors on cl.class_id = professors.class_idJOIN classrooms on cl.classroom_id = classrooms
下面的PostgreSQL查询有什么问题?LEFTJOIN account_analytic_account ON account_analytic_account.id = project_project.analytic_account_idLEFTJOIN assignments ON assignments.accounts_ref = account_analytic_account.id[SQL] UPDATE project_projectpp SET pp.
我使用updateleftjoin语句更新了一个现有表,如下所示:SET A.SPSS_FieldForce = B.RemarksleftJOIN remarks_master_data as B 但是,我需要将SPSS_FieldForce列中的空值替换为目前,我使用另一条语句这样做: FBL1IN_wo
SELECT a1,a2,a3,a4,count(a5),b1,b2,b3LEFTJOIN table2 ON a1=b1 AND a2=b2 (*here i need tojoin
next columns a3=b3 only if from table2 will be returned more than 1 records
今天,我们遇到了由这个确切的查询(当然使用不同的名称)引起的主要性能问题:LEFTJOIN bar SET foo.flag =然而,这并不是在所有情况下都是可能的-而且我不认为在bar.foo_id上创建索引应该有效果,因为NULL值只能由于JOIN语句而出现。+-----+-------------+---------------------+-------+---+------+--------+------------------------