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WHERE clauseA WHERE clause is an optional part of a SelectExpression, DELETE statement, or UPDATE statement. The WHERE clause lets you select rows based on a boolean expression. Only rows for which the expression evaluates to TRUE are returned in the result, or, in the case of a DELETE statement, deleted, or, in the case of an UPDATE statement, updated. Syntax
SQL-J extends the SQL-92 WHERE clause to allow any boolean expression. Most of the general expressions listed in Table 1-7, Table of Expressions,, can result in a boolean value. In addition, SQL-J allows the following as expressions in a WHERE clause:
For example, the following are valid SQL-J WHERE clauses: In addition, there are the more common boolean expressions. Specific SQL-J boolean operators listed in Table 1-8, SQL-J Boolean Operators,, take one or more operands; the expressions return a boolean value. Examples
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