情况语句
- 【计】case statement
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默认情况下,UPDATE语句以传统方式处理包含业务时段的表。
By default , UPDATE statements behave traditionally for tables with business time periods .
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如下例所示,在此情况下,查询语句获得用户的名称和电子邮件地址。
In this scenario a query gets the name and e-email address from a user , as in the following example .
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您还会注意到,我不需要在语句之间(除了特定情况下)加入语句分隔符,像分号。
You will also notice that I don 't need to put statement separators , like semicolons , in between statements except in certain cases .
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另一方面,Net.Data仅支持立即执行,在这种情况下每次执行语句时都要准备语句。
Net . Data , on the other hand , supports only immediate execution , where the prepare is done each time a statement executes .
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某些情况下,如果语句包含主机变量、参数标记或特殊寄存器那么访问路径在运行时的性能不会很好。
In some cases , the access path does not perform well at runtime if the statement contains host variables , parameter markers , or special registers .