Oracle/PLSQL: NVL Function In Oracle/PLSQL, the NVL function lets you substitute a value when a null value is encountered. The syntax for the NVL function is: NVL( string1, replace_with ) string1 is the string to test for a null value. replace_with is the value returned if string1 is null. Applies To: Oracle 8i, Oracle ...
Oracle =========================================================== Books: Database Concepts ----------------------------------------------------------- Database Structure and Space Management ----------------------------------------------------------- Logical Database Structure * Schema/Schema object(the logical structures that directly refer to the DB's data a schema is owned by a user who has the same name as the schema) Table View Index Cluster * Data block * Extent * Segment * Tablespace Online(accessible)and Offine(not accessible) * Databse, TableSpaces, and Datafiles Physical Database Structures * Datafiles (the charateristics of ...
CURRVAL AND NEXTVAL A sequence is a schema object that can generate unique sequential values. These values are often used for primary and unique keys. You can refer to sequence values in SQL statements with these ...
These two days, I was working on getting timezone information from oracle using Hibernate. The version of Hibernate is 3.2.4. I found that the return value always returned a Calendar with the tomcat server's timezone when we were getting a Calendar field. My environment: a column with data type ...