将数据与另一个选择查询的结果插入表中 [英] Insert data into table with result from another select query

问题描述

我正在就以下问题寻求帮助: 我有两张桌子 Table_1列是itemid，locationid，quantity

I am seeking help on the following issue: I have two tables Table_1 columns are itemid, locationid, quantity

Table_2列是itemid，location1，location2，location3

我想将数据从Table_1(仅quantity列)复制到Table_2(到location1列).两个表中的itemid是相同的(Table_1具有重复的项目ID)，所以这就是我要复制到新表并将所有数量都保留在一行中且每个位置都作为一列的原因.我正在使用以下查询，但无法正常工作

I want to copy data from Table_1 (only quantity column) into Table_2 (into location1 column). The itemid are same in both the tables(Table_1 has duplicate item id's) so that's the reason I want to copy to a new table and keep all quantity in one single row with each location as a column. I am using the below query but it doesn't work

INSERT INTO 
Table_2(location1) 
(
 SELECT qty 
 FROM Table_1 
 WHERE locationid = 1 AND Table_1.locationid = Table_2.locationid
)

推荐答案

如果table_2为空，则尝试以下插入语句:

If table_2 is empty, then try the following insert statement:

insert into table_2 (itemid,location1) 
select itemid,quantity from table_1 where locationid=1

如果table_2已经包含itemid值，请尝试以下更新语句:

If table_2 already contains the itemid values, then try this update statement:

update table_2 set location1=
(select quantity from table_1 where locationid=1 and table_1.itemid = table_2.itemid)

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