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    Question :
    What are the properties and different Types of Sub-Queries?
    Category PostgreSQL Interview Questions
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    Added on 3/20/2012
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    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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