子查询返回的值不止一个。当子查询跟随在 =、!=、<、<=、>、>= 之后,或子查询用作表达式时,这种情况是不允许的。
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基金项目 国家自然科学基金资助项目(81301949);天津市自然科学基金资助项目(16jcybjc26500) 作者简介 郝晓东( 1991-), 男 ,硕士在读,研究方向: 泌尿外科疾病 ; 通信作者:张志宏 ,E-mail:zhihongzhang1967@163.com。