Question

table_1 (id, first_Name, last_Name)

table_2 (id, name, table_1_id)

我的工作是将一个列的所有值从table_1复制到table_2作为单独的条目。我的问题是

QUERY_1：

insert into table_2 ( name, table_1_id )  
   select first_Name as name, id as table_1_id from table_1.

我的其他疑问是

Query_2：

insert into table_2 ( name, table_1_id )  
   select last_Name as name, id as table_1_id from table_1.

它运行得很好，但保存所有first_name然后保存所有last_name。我的要求是将这两个查询一起运行，并希望结果类似于

first_Name(whatever) table_1_id (1)

last_Name(whatever) table_1_id(1)

first_Name(whatever) table_1_id(2)

last_Name(whatever) table_1_id(2)

提前致谢

注意：table_1_id不是table_2

中的外键

Answer 1

您可以使用union all：

来实现此目的

INSERT INTO table_2( name, table1_id)
select name, id from
    (
    select first_name as name, id from table_1
    union all
    select last_name as name, id from table_1
    ) A 
    order by id

Answer 2

尝试使用WITH Queries (Common Table Expressions)

   WITH cte AS (
    insert into table_2 ( name, table_1_id )  
    select first_Name as name, id as table_1_id from table_1
    )
    insert into table_2 ( name, table_1_id )  
    select last_Name as name, id as table_1_id from table_1

并按select * table_2 order by table_1_id

测试值

如何逐个执行多个查询

2 个答案: