插入 select 语句，将所有其他列设置为空

Question

我正在尝试运行此插入 select 语句：

insert into xyz (select t1.column1, t1.column2 from table1 t1, table2 t2 
where t1.column1 = t2.column1)

但是得到错误："The number of values assigned is not the same as the number of specified or implied columns or variables"

我想将所有其他列设置为空（例如 t1.column3 到 t1.column50）。

有没有一种方法可以做到这一点而不必在 select 语句中明确列出所有列？

insert into xyz (select  t1.column1, t1.column2, null as column3, null as column4, null as 
column5... from table1 t1, table2 t2 
where t1.column1 = t2.column1)

Answer 1

您可以列出插入列表中的列。例如

insert into xyz ( column1, column2 )
select t1.column1, t1.column2
from table1 t1
,    table2 t2 
where t1.column1 = t2.column1

所以，例如

create table xyz( column1 int not null, column2 int not null, column3 int);
create table table1( column1 int not null, column2 int not null);
create table table2( column1 int not null);
insert into table1 values (1,2),(2,3);
insert into table2 values (1),(2);
select * from xyz;

给予

 COLUMN1 COLUMN2 COLUMN3
 ------- ------- -------
       1       2    NULL
       2       3    NULL

插入 select 语句，将所有其他列设置为空

Insert into select statement that sets all other columns to null

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