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可以將一個select的結果用作另一個select語句的表(換句話說:upper)選擇語句。有相當於JPQLjpql select into select
這裏是我的示例SQL語句
SELECT X.NAME, SLS.TOTAL AS BENEFIT
(SELECT * FROM PERSON) X
INNER JOIN SALESMAN SLS ON SLS.PERSON_ID = X.ID
什麼equivalant這種說法在JPQL?
爲什麼你需要嵌套的'SELECT *'? - 它會殺死的性能。您可以通過'SELECT X.NAME,SLS.TOTAL AS BENEFIT更有效地獲得相同的結果 FROM PERSON X INNER JOIN SALESMAN SLS ON SLS.PERSON_ID = X.ID' –
如果您還沒有閱讀,請看看[http://openjpa.apache.org/builds/1.2.3/apache-openjpa/docs/jpa_langref.html#jpa_langref_subqueries] –
SELECT X.NAME,SLS.TOTAL AS BENEFIT FROM PERSON INNER JOIN SALESMAN SLS ON SLS.PERSON_ID = PERSON.ID 它重複的結果,所以我使用嵌套選擇 – user2648768