本文介绍了Ansi SQL类型转换的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
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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