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Showing posts with the label Exists
I Need An Jpa/sql Expert: Exists Query On An Inner Join Returns Wrong Result

I Need An Jpa/sql Expert: Exists Query On An Inner Join Returns Wrong Result

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I have three tables and want to: Select all students from the first table, that have at least on… Read more I Need An Jpa/sql Expert: Exists Query On An Inner Join Returns Wrong Result
Is It Possible To Optimize Query Using The Exists Instead Of In Clause With Distinct

Is It Possible To Optimize Query Using The Exists Instead Of In Clause With Distinct

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I have query which works. select contract_no AS c_no, cm_mac AS c_mc, MIN(tstamp) as time2, sum(1) … Read more Is It Possible To Optimize Query Using The Exists Instead Of In Clause With Distinct
Shuold I Use Not Exists Or Join Statement To Filter Out Nulls?

Shuold I Use Not Exists Or Join Statement To Filter Out Nulls?

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SELECT * FROM employees e WHERE NOT EXISTS ( SELECT name FROM eo… Read more Shuold I Use Not Exists Or Join Statement To Filter Out Nulls?
Sql Do Not Insert Duplicates

Sql Do Not Insert Duplicates

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I have been looking for a solution to best implement a do not insert if the line already exists. I&… Read more Sql Do Not Insert Duplicates
Sql "if Exists..." Dynamic Query

Sql "if Exists..." Dynamic Query

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Suppose I have a query stored in a variable like this (it's actually dynamically populated and … Read more Sql "if Exists..." Dynamic Query
Using If Exists (select ...) In A Before Insert Trigger (oracle)

Using If Exists (select ...) In A Before Insert Trigger (oracle)

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The code I have doesn't work, Oracle tells me the trigger has been created with build errors. A… Read more Using If Exists (select ...) In A Before Insert Trigger (oracle)