In general, each value in the enumeration can be an arbitrary scalar SQL expression.

一般情况下，枚举中的每一个值都可以成为任意标量SQL表达式。

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You can use a scalar subquery to select a specific value that will be used in the expression of the WHERE clause.

可以使用标量子查询选择将用于where子句的表达式中的特定值。

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Both work fundamentally the same way, at compile time the keyword "var" is replaced with the correct scalar or array type for the associated expression.

二者的实现基础完全相同，即在编译时将“var”替换成为分析得到的正确的变量或数组类型表达式。

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