एक ही रिकॉर्ड पर कई पंक्तियाँ लौटाएँ

आप ऐसा कुछ कर सकते हैं:

select 
 (select id from table X where X.something = 123) as row1Id,
 (select id from table X where X.something = 456) as row2Id,
 (select id from table X where X.something = 789) as row3Id