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WHERE
Clause 
A where clause is used to filter columns by a search condition.

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<where clause> ::= WHERE <search condition>. |
The result of the <where clause> is a result table consisting of the set of rows for which the evaluation of the <search condition> yields true.
No <set function> shall be specified in a <where clause>.
Search Condition, UPDATE, DELETE, Query Specification, SELECT FOR UPDATE, SELECT INTO
