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。  梨树形改造与优化技术研究-《北方园艺》
[1]赵 德 英,程 存 刚,曹 玉 芬,等. 梨树形改造与优化技术研究[J].北方园艺,2011,35(01):0.[doi:10.11937/bfy.201101001]
 ZHAO De -ying,CHENG Cun -gang,CAO Yu -fen,et al. Study on Modifying andOptimization T echnology of T ree Form in Pear T ree[J].Northern Horticulture,2011,35(01):0.[doi:10.11937/bfy.201101001]
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 梨树形改造与优化技术研究

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更新日期/Last Update: 2016-09-17