sqlCombing two subqueries and us

sql - Combing two subqueries and use either of the value depends on which one is not null - Stack Overflow
There tables are there VAC_NRD, VAC_DOC, VAC_TRV.If this query return VAC_ID empty.SELECT VAC_ID FROM V
sqlCombing two subqueries and use either of the value depends on which one is not nullStack Overflow
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