Question

I have two tables

Table1

REF1 REF2
     A
     B
     C

Table2

UPN Filename
1   A
2   B
3   C

what I want to do in SQL is this

If Table1 REF2 = Table2 Filename then set Table1 REF1 = Table2 UPN

this is the sql I did

UPDATE    Table1
SET       REF1 = Table2.UPN
FROM      Table1 INNER JOIN Table2 
ON        Table1.REF2 = Table2.FileName 

all this does is take the first value in row 1 of table2 and put it in every row under table1 in REF1

eg this is what I get

TABLE1

REF1 REF2
1    A
1    B
1    C

this is what I want

TABLE1

REF1 REF2
1    A
2    B
3    C

any help appreciated.

Answer 1

To do this in SQL Server, here is the syntax:

UPDATE t1
SET t1.REF1 = t2.UPN
FROM Table1 AS t1
INNER JOIN Table2 t2 ON t1.REF2 = t2.FileName