WSFL要求明确指定这些角色,以作为流程实现的一部分。
WSFL requires that you explicitly specify these roles as part of the process implementation.
模式不需要明确指定一列是主键或唯一键来产生星型连接计划。
The schema does not need to specify explicitly that a column is a primary or unique key to produce a star join plan.
如果明确指定今天的日期,结果会与所指定的完全一致。
The result is the same as if we had specified today's date explicitly.
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