Oracle 11g:Scalar Subquery expression Limitation

Scalar subqueries are not valid expressions in the following places:
 
- As default values for columns
- As hash expressions for clusters
- In the RETURNING clause of DML statements
- As the basis of a function-based index
- In CHECK constraints
- In GROUP BY clauses
- In statements that are unrelated to queries, such as CREATE PROFILE




Reference:http://docs.oracle.com/cd/B28359_01/server.111/b28286/expressions013.htm

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