anyways,大家遇到这个问题可以在找个网上找个免费的online-compiler
数据库技术:sql server设置联合主键
这一行代码,在ast中的结构如下:我们来看看变量b对应的identifier节点
sql92设置语句
比较要用is而不是=图1setansi_nullson --见图1setquoted_identifier
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