将数据从SQL Server表导入另一个表

Question

I can't get this SQL statement right. I want to select band emails into another table but I don't understand what I'm doing wrong:

INSERT INTO submitted (mail)
    SELECT
        submitted.bandid,
        band.mail,
        band.id
    FROM 
        band
    WHERE 
        submitted.bandid = band.id

Can anybody help me?

Answer 1

Try this, you had specified 1 column to INSERT INTO but your SELECT query contained 3 columns, also the tables in your weren't joined:

INSERT INTO submitted (mail) 
SELECT
band.mail
FROM band 
INNER JOIN submitted ON submitted.bandid = band.id

Answer 2

You haven't mentioned the error message you're getting, but I suspect the problem is that you only have one column specified in the INSERT part of the statement, but the SELECT part returns many columns.

This w3schools page has a good example of how this query should be structured:

Copy only some columns from one table into another table:

 INSERT INTO table2 (column1, column2, column3, ...) SELECT column1, column2, column3, ... FROM table1 WHERE condition; 

Answer 3

I suspect you want update , not insert :

UPDATE s
    SET mail = b.mail
    FROM submitted s JOIN
         band b
         ON s.bandid = b.id;

insert inserts new rows into the table. update updates columns in existing rows.