第一个条件陈述式用于输入验证。
The first conditional statement is used for input validation.
加入测试条件或其他判断提示陈述式来验证指令码的结果。
Add test conditions or other assert statement to verify the script results.
一般来说，您会想要使用筛选条件或参数来限制资料录的选取，可能会采用 排序资料录或自订SQL陈述式等方式。
Typically, you want to constrain the record selection with a filter or parameters, perhaps sort the records, customize the SQL statement.
会略过将多个条件约束加入到资料表的陈述式。
Statements that add multiple constraints to a table are skipped.
加入、移除，或变更条件式编译陈述式的评估运算式。
Adding, removing, or changing the evaluation expression of a conditional compilation statement.
依据运算式的值，有条件的执行一组陈述式。
Conditionally executes a group of statements, depending on the value of an expression.
依据运算式的值，有条件的执行一组陈述式。
Conditionally executes a group of statements, depending on the value of an expression.
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