what is the difference of select single and select up to one row in abap

最新推荐文章于 2025-10-24 18:42:01 发布

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#select single #select up to one row

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本文深入探讨了SQL查询中Select single与Select up to 1行的区别，解释了在使用时应注意的问题。重点强调了在确保所有返回记录具有相同值的情况下使用Select up to 1行的重要性，避免误读结果。

Select single is a construct designed to read database records with primary key. In the absence of the primary key, it might end up doing a sequential search, whereas the select up to 1 rows may assume that there is no primary key supplied and will try to find most suitable index.

Use "select up to 1 rows" only if you are sure that all the records returned will have the same value for the field(s) you are interested in. If not, you will be reading only the first record which matches the criteria, but may be the second or the third record has the value you are looking for.