Category Archives: Oracle

Oracle Null Safe Comparison (Spoiler alert: SYS_OP_MAP_NONNULL)

Posted on October 18, 2017 by Aykut Akin

Even most experienced programmers are caught null comparison trap time to time. Let’s say we have two different customer tables and our business need is to find the customers that has the same first name, middle name and last name … Continue reading →

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Installation of Oracle SQL Developer to Ubuntu

Posted on July 22, 2017 by Aykut Akin

First of all, you need to install Java in your environment. I will continue with the latest OpenJDK version currently available. Easiest method to install jdk is to write following commands to the terminal: And put below content inside of … Continue reading →

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Getting result from database in shell script

Posted on July 12, 2016 by Aykut Akin

In shell script, there is no standard way of connecting and retrieving result from database. But, for Oracle we can use SQLPlus to connect and run operations on database. I tried my codes on bash for this post and codes … Continue reading →

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Oracle Time Overlaps (WM_OVERLAPS)

Posted on August 28, 2013 by Aykut Akin

Oracle has undocumented and documented functions for time operations. In this writing, I will mention the undocumented ‘overlaps’ and documented ‘wm_overlaps’ functions. Actually, they do the same work, but they have some differences. Our aim is to find that two … Continue reading →

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Create Html Table From Oracle Table In PL/Sql

Posted on June 18, 2013 by Aykut Akin

Sometimes we need to represent a database table as HTML table. In such situations there is no standart way of doing this. So that, I write a Oracle package for converting sql query to html table code with using Oracle … Continue reading →

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Oracle Import Mining Model to Database

Posted on May 7, 2013 by Aykut Akin

You can import your mining models to Oracle database and you can easily call those models from select statements and procedures. In this post I will try to explain how to do that. First of all you must create a … Continue reading →

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Oracle Create External Table

Posted on April 16, 2013 by Aykut Akin

Oracle lets you to use an organized files as a regular table. With that way, you can easily use select statements with your file. First of all, we need to create a logical directory name for Oracle on behalf of … Continue reading →

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Java Prepared Statements (Oracle Cursor Sharing & Bind Variables)

Posted on March 13, 2013 by Aykut Akin

My last post is about Oracle bind variables and cursor sharing. In this post, I will talk about how to use and how not to use sql queries in Java. Let’s make a basic sql query and analyze the performances … Continue reading →

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Oracle Cursor Sharing & Bind Variables

Posted on February 18, 2013 by Aykut Akin

In Oracle, queries are kept in Shared Pool to improve performance. If we send the query which is already in Shared Pool, Oracle may pass the parsing part and use the same execution plan for that query. Oracle compares these … Continue reading →

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ORA-30926: unable to get a stable set of rows in the source tables

Posted on January 29, 2013 by Aykut Akin

In my recent project I get this error while I’m using Merge in Oracle. After some searching I found the problem and decided to write a post about it:) The reason of this error is source table. In merge queries … Continue reading →

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