T-SQL INSERT INTO with LEFT JOIN

Question

對不起，這是一個語法問題，但在T-SQL中，我該如何在INSERT語句中指定哪個數據庫要插入哪個數據庫，以及在哪個數據庫中要加入哪個數據庫？

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 

對不起，這樣的noob問題，但我找不到合適的例子。

Answer 1

你想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; 

我也固定使用表別名的查詢，所以它更容易閱讀。

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