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Updating SQL table with data from another table based on specific values

Hello,

I have the following 2 tables:

TBL1
COL1    COL2
100       A
200       B
300       C

TBL2
COL1   COL2
W         300
X          200
Y          100
Z         300

What I would like to be able to do is update TBL2.COL2 with TBL1.COL1's data based on specific values in TBL1.COL2.

If TBL1.COL2 = C then update TBL2.COL2 with TBL1.COL1's data where TBL1.COL2 = A

So TBL2 will end up looking like this:

TBL2
COL1    COL2
W         100
X          200
Y          100
Z         100
0
turnstyles1
Asked:
turnstyles1
1 Solution
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
should be like this:
UPDATE t2
  SET col2 = t1b.col1
 FROM tbl2 t2
 JOIN tbl t1a
   ON t1a.col1 = t2.col2
  AND t1a.col2 = 'C'
 JOIN tbl t1b
   ON t1b.COL2 = 'A' 

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0
 
SharathData EngineerCommented:
>> update TBL2.COL2 with TBL1.COL1's data based on specific values in TBL1.COL2.  
>> If TBL1.COL2 = C then update TBL2.COL2 with TBL1.COL1's data where TBL1.COL2 = A
 
Didn't understand your statement clearly.
0
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