Some time ago, Oracle removed the download links to Oracle 10g Express Edition (XE). If you need to do a new install of the Oracle […]
Database, DB2, Oracle, SQL
Concatenate Strings from a Column Into a Single Row
Sometimes there is a need to concatenate strings from a column into a single row. Some databases already provide a solution with the GROUP_CONCAT() aggregate […]
Database, Oracle, Regular Expression, SQL
Count Word Occurrences in Oracle String
As of Oracle 11 you can use the REGEXP_COUNT function to count the number of occurrences of a word or string in a varchar. However, […]
Database, DB2, Oracle, SQL
SQL Developer with a DB2 Database
Originally called Raptor – SQL Developer has become quite a decent SQL Development tool over the years. The nice thing about it, besides the fact […]
Database, Oracle, SQL
Catching errors in Oracle
Sometimes there is a need to find out exactly which Oracle errors are occurring in your code, because your application stacktrace or your log files […]
Database, Oracle, SQL
Order of predicates in WHERE clause
It is often assumed that the order of the predicates in the WHERE clause of an Oracle SELECT statement does not matter or that it […]
Database, Oracle, Regular Expression, SQL
Regular Expressions in Oracle
Regular Expressions (RE) are a powerful feature in Oracle. I have found them to be most useful for situations where you need to quickly find […]