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2025-02-25 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Editor to share with you the use of exists in oracle, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it! Exists is followed by a subquery
The following two tables are examples to demonstrate the association between id in table an and aid in table b
The function of exists is to check whether the result of the subquery is true or not, and execute the outer SQL statement if the subquery is true. Exists returns no data, only true or false.
If false is returned, the outer SQL statement is not executed
The above is all the contents of the article "how to use exists in oracle". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
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