Ansi SQL类型转换 [英] Ansi SQL type casting

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是否允许在ANSI SQL中强制转换类型，例如在postgres中

SELECT SUM( CAST(qnty AS int) - CAST(reserve AS int) )  AS sum
...

qnty 和 reserve 是字符列.

解决方案

在SQL-92中添加了CAST表达式.例如，您可以在草稿中看到它.. >

Is it allowed to cast types in ANSI SQL like in postgres for example:

SELECT SUM( CAST(qnty AS int) - CAST(reserve AS int) )  AS sum
...

qnty and reserve are character columns.

解决方案

The CAST expression was added in SQL-92. You can see it for example in this draft.

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