UNION (非UNION ALL)在Oracle SQL中不起作用,它如何重写它才能在Oracle中起作用?查询结构如下: select KEY, CODE from table1UNION(NOT UNION ALL)join ORG on KEY = KEY
join REGION on KEY = KEY
我有一个类似于下面的查询 select ID, name, tag, tag_1, tag_2, tag_3, tag_4, location from table_one select * from t value for _tag_ in (tag,tag_1,tag_2,tag_3,tag_4)现在,我想加入3个其他表table1,table2,table3到上面,我需要从这些表中选择其他列例如col1,col2,col3。有没有任何关于如何进行的想法。
select 1 AS id, NULL AS parent, 'God' AS name select 2 AS id, 1 AS parent, 'Father' ASname select 3 AS id, 2 AS parent, 'Son' AS name select 4 AS id, NULL ASparent, 'Godmother' AS name
我一直在寻找Oracle中类似于SQL Server中的表变量的内容。我发现人们在这里提出这样的问题,人们总是说“是的,Oracle有”,但是例子表明,这些实体根本不像Server。有人能告诉我如何在Oracle中执行以下简单的TSQL解决方案吗?select 1001 as UserID , 220 as ClassID, 2 as Grade select 1021 as UserID , 130 asClassID, 4 as Grade se