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What are the properties and different Types of Sub-Queries?

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What are the properties and different Types of Sub-Queries?
posted Nov 26, 2014 by Roshan

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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

answer Nov 26, 2014 by Manikandan J
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