Properties of Sub-Query A sub-query must be enclosed in the parenthesis. A sub-query must be put in the right hand of the comparison operator, and A sub-query cannot contain an ORDER-BY clause. A query can contain more than one sub-query. Types of Sub-Query Single-row sub-query, where the sub-query returns only one row. Multiple-row sub-query, where the sub-query returns multiple rows,. and Multiple column sub-query, where the sub-query returns multiple columns
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