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日期:2025-04-26
註意在這個語句中, =(select b.city_name,b.customer_type from tmp_cust_city b where b.customer_id=a.customer_id ) 與 (select 1 from tmp_cust_city b where b.customer_id=a.customer_id) 是兩個獨立的子查詢,查看執行計劃可知,對b表/索引掃描了 2 篇;...
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日期:2025-04-23
This SQL tutorial explains how to use the SQL EXISTS condition with syntax and ... It can be used in a SELECT, INSERT, UPDATE, or DELETE statement....
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日期:2025-04-25
This Oracle tutorial explains how to use the Oracle EXISTS condition with syntax and ... It can be used in a SELECT, INSERT, UPDATE, or DELETE statement....
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日期:2025-04-25
2009年4月23日 - I saw this code in one of the procedures we are using ... is it possible to avoid EXIST caluse: update table_x p set p.internal_issue_ky = (select ......
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日期:2025-04-23
2011年5月14日 - WHERE EXISTS (SELECT 1 FROM EMP_CLUB WHERE EMPNO ... Scenario: Update the commission of black listed employees to zero....
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日期:2025-04-29
2000年6月8日 - The reason (probably) this is taking long is because the update above is forced to FULL scan T1 and for every row, run the where exists query ......
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日期:2025-04-26
2008年3月28日 - Deepankar makes use of the where exists clause to demonstrate the ... update EMP a set a.name =(select name from DEPT b where a.id=b.id );....
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日期:2025-04-28
2010年10月25日 - Oracle sql doesnt accept IF EXISTS , otherwise I would have done an if - update - else - insert query. I've looked at MERGE but it only works for ......