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Showing posts with the label Oracle
Oracle: Why I Cannot Rely On Rownum In A Delete Clause

Oracle: Why I Cannot Rely On Rownum In A Delete Clause

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I have a such statement: SELECT MIN(ROWNUM) FROM my_table GROUP BY NAME HAVING COUNT(NAME) > 1… Read more Oracle: Why I Cannot Rely On Rownum In A Delete Clause
Non-trivial Merge Of Two Tables

Non-trivial Merge Of Two Tables

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There are two tables 1 and 2 with columns: Id: unique ; timestamp:long; money:double SOME RECORDS … Read more Non-trivial Merge Of Two Tables
Cartesian Products And Selects In The From Clause

Cartesian Products And Selects In The From Clause

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I need to use a select in the from clause but I keep getting an Cartesian product. select customer… Read more Cartesian Products And Selects In The From Clause
Performance Issue When Updating Table From Another Table

Performance Issue When Updating Table From Another Table

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I'm trying to update old customers data with new data, so basically I'm updating firstname … Read more Performance Issue When Updating Table From Another Table
Use Top Or Rank When Finding The First Few Or The Most Observations

Use Top Or Rank When Finding The First Few Or The Most Observations

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I have searched others' code and tried to customize in my case, but it seemed when the question… Read more Use Top Or Rank When Finding The First Few Or The Most Observations
Retrieving Entries Of Linked List In Relational Database

Retrieving Entries Of Linked List In Relational Database

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For my project, I implemented linked list with rdbms. The linked list uses rowid column as a pointe… Read more Retrieving Entries Of Linked List In Relational Database