Optional clause to be used only where appropriate.
只有在适当的情况下才使用选择条款。
Since DB2 9.5 you can add the optional clause REJECT INVALID VALUES to your XML index definition.
从DB 2 9.5往后，您就可以向xml索引定义添加可选的REJECTINVALIDvalues子句。
BULK COLLECT is not a statement on its own, but an optional clause that can be applied to SELECT INTO and FETCH statements.
BULKCOLLECT自身不是语句，而是可用于SELECTINTO和fetch语句的可选子句。
The delete statement deletes all rows from the specified table that satisfy an optional WHERE clause.
delete语句从指定表中删除满足可选where子句的所有行。
The while loop, as was the case with the if statement, supports an optional else clause containing a block of program statements executed when the expression is False.
while循环与if语句一样，支持一个可选的else子句，其中包含一个当表达式计算为False时执行的程序语句块。
The if statement supports an optional else clause that indicates a block of program statements that should be processed if the Boolean expression evaluates False.
if语句支持一个可选的else子句，指示当布尔表达式计算为False时应该处理的程序语句块。
A transform expression starts with the optional "transform" keyword followed by a COPY, MODIFY, and a RETURN clause.
转换表达式的开头是可选的“transform”关键字，然后是COPY、MODIFY和return子句。
Each probe clause consists of a probe point specification statement, action block, and an optional predicate.
每个探测子句由一个探测点指定语句、动作块和可选的断言组成。
Each FLWR expression has one or more for clause, one or more let clause, an optional where clause, and a return clause.
每个FLWR表达式都有一个或多个for子句、一个或多个let子句、一个可选的where子句以及一个return子句。
The optional STORE IN clause lets you specify one or more tablespaces into which the database stores interval partition data using a round-robin algorithm for subsequently created interval partitions.
STORE IN参数可以明确间隔分区使用的一个或多个表空间，他使用的是循环算法来创建间隔分区。
The optional STORE IN clause lets you specify one or more tablespaces into which the database stores interval partition data using a round-robin algorithm for subsequently created interval partitions.
STORE IN参数可以明确间隔分区使用的一个或多个表空间，他使用的是循环算法来创建间隔分区。
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