Conditional Query in Oracle


I need suggestion on a conditional query in Oracle like the followings.
say I have a table TBL1 with field1,field2 and field3.
I want to have select statement like the following

if TBL1.field1= 'X' then TBL1 left join TBL2
if TBL1.field1= 'Y' then TBL1 left join TBL3
if TBL1.field1= 'Z' then TBL1 left join TBL4

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ste5anSenior DeveloperCommented:
	LEFT JOIN TBL2 T2 ON <JoinCondition> AND T1.field1 = 'X'
	LEFT JOIN TBL3 T3 ON <JoinCondition> AND T1.field1 = 'Y'
	LEFT JOIN TBL4 T4 ON <JoinCondition> AND T1.field1 = 'Z';

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Is field1 in tbl1 always going to contain only 'X' or "Y" or 'Z"?
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