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How can I do an UPDATE statement with JOIN in SQL Server?


Question

I need to update this table in SQL Server with data from its 'parent' table, see below:

Table: sale

id (int)
udid (int)
assid (int)

Table: ud

id  (int)
assid  (int)

sale.assid contains the correct value to update ud.assid.

What query will do this? I'm thinking of a join but I'm not sure if it's possible.

2020/04/13
1
1333
4/13/2020 10:05:15 AM

Accepted Answer

Syntax strictly depends on which SQL DBMS you're using. Here are some ways to do it in ANSI/ISO (aka should work on any SQL DBMS), MySQL, SQL Server, and Oracle. Be advised that my suggested ANSI/ISO method will typically be much slower than the other two methods, but if you're using a SQL DBMS other than MySQL, SQL Server, or Oracle, then it may be the only way to go (e.g. if your SQL DBMS doesn't support MERGE):

ANSI/ISO:

update ud 
     set assid = (
          select sale.assid 
          from sale 
          where sale.udid = ud.id
     )
 where exists (
      select * 
      from sale 
      where sale.udid = ud.id
 );

MySQL:

update ud u
inner join sale s on
    u.id = s.udid
set u.assid = s.assid

SQL Server:

update u
set u.assid = s.assid
from ud u
    inner join sale s on
        u.id = s.udid

PostgreSQL:

update ud
  set assid = s.assid
from sale s 
where ud.id = s.udid;

Note that the target table must not be repeated in the FROM clause for Postgres.

Oracle:

update
    (select
        u.assid as new_assid,
        s.assid as old_assid
    from ud u
        inner join sale s on
            u.id = s.udid) up
set up.new_assid = up.old_assid

SQLite:

update ud 
     set assid = (
          select sale.assid 
          from sale 
          where sale.udid = ud.id
     )
 where RowID in (
      select RowID 
      from ud 
      where sale.udid = ud.id
 );
2020/03/10
2418
3/10/2020 3:56:40 AM

This should work in SQL Server:

update ud 
set assid = sale.assid
from sale
where sale.udid = id
2017/08/31

postgres

UPDATE table1
SET    COLUMN = value
FROM   table2,
       table3
WHERE  table1.column_id = table2.id
       AND table1.column_id = table3.id
       AND table1.COLUMN = value
       AND table2.COLUMN = value
       AND table3.COLUMN = value 
2015/11/09

A standard SQL approach would be

UPDATE ud
SET assid = (SELECT assid FROM sale s WHERE ud.id=s.id)

On SQL Server you can use a join

UPDATE ud
SET assid = s.assid
FROM ud u
JOIN sale s ON u.id=s.id
2009/08/18

PostgreSQL:

CREATE TABLE ud (id integer, assid integer);
CREATE TABLE sales (id integer, udid integer, assid integer);

UPDATE ud
SET assid = sales.assid
FROM sales
WHERE sales.id = ud.id;
2014/05/08

Simplified update query using JOIN-ing multiple tables.

   UPDATE
        first_table ft
        JOIN second_table st ON st.some_id = ft.some_id
        JOIN third_table tt  ON tt.some_id = st.some_id
        .....
    SET
        ft.some_column = some_value
    WHERE ft.some_column = 123456 AND st.some_column = 123456

Note - first_table, second_table, third_table and some_column like 123456 are demo table names, column names and ids. Replace them with the valid names.

2014/07/14

Source: https://stackoverflow.com/questions/1293330
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