使用LEFT JOIN进行T-SQL INSERT INTO

Question

对不起,这是一个语法问题,但是在T-SQL中如何在INSERT语句中指定我想要INSERT哪个DB以及LEFT JOIN从哪个DB加入？

if not exists (select * from [DB_A].[dbo.a_test])
create table [DB_A].[dbo.a_test] (
a int(10) ,
b int(10) ,
c varchar(200) ,
d varchar(200) ,
e varchar(200) ,            
PRIMARY KEY (a)
)


INSERT INTO [DB_A].[dbo.a_test] (a,b,c, d)
VALUES dbo.products.product_info, dbo.products.product_date, dbo.products.smth, *dbo.program.program_name*, dbo.program.program_smth
FROM [DB_B].dbo.products    
LEFT JOIN [DB_B].dbo.program
ON dbo.program.program_name = dbo.products.product_info

很抱歉这样一个noob问题,但我找不到合适的例子.

Answer 1

你想要insert into . . . select:

INSERT INTO [DB_A].[dbo.a_test](a,b,c,d,e) --ADDED A COLUMN
    select p.product_info, p.product_date, p.smth, pr.program_name, pr.program_smth
    FROM [DB_B].dbo.products p LEFT JOIN
         [DB_B].dbo.program pr
         ON p.program_name = pr.product_info;

我还修复了查询以使用表别名,因此它更容易阅读.

Answer 2

INSERT INTO [DB_A].[dbo.a_test] (a,b,c, d)
SELECT dbo.products.product_info, dbo.products.product_date, dbo.products.smth, dbo.program.program_smth
FROM [DB_B].dbo.products    
LEFT JOIN [DB_B].dbo.program
ON dbo.program.program_name = dbo.products.product_info