If Exists command in setting a variable

Question

I've got a working IF EXISTS command to select a PID_GUID that's already in the tables, or to select a value to use as a PID_GUID if it does not exist already in the tables. The command looks like this;

IF EXISTS (SELECT PID_GUID FROM PID WHERE EDI_ID = '12874' OR PID = 'ROBERT' OR PID = 'R595')
 BEGIN
   SELECT PID_GUID FROM PID WHERE EDI_ID = '12874' OR PID = 'ROBERT' OR PID = 'R595'
 End
 ELSE
   SELECT 'a70600f4-1cff-4284-a2ce-5eb19f47cf19'

Now what I would like to do is put this into setting a variable such as this;

Daclare @OLDPID = VARCHAR(36)
SET @OLDPID = IF EXISTS (SELECT PID_GUID FROM PID WHERE EDI_ID = '12874' OR PID = 'ROBERT' OR PID = 'R595')
 BEGIN
   SELECT PID_GUID FROM PID WHERE EDI_ID = '12874' OR PID = 'ROBERT' OR PID = 'R595'
 End
 ELSE
   SELECT 'a70600f4-1cff-4284-a2ce-5eb19f47cf19'

How would I go about doing this in SQL2008?

If Exists command in setting a variable

2 Answers