Recent Notes

Displaying keyword search results 1 - 4
Created by Dr. Xi on September 06, 2007 03:11:40    Last update: January 31, 2013 12:13:45
The built-in function SYSDATE returns a DATE value containing the current date and time on your system. For example, UPDATE ACCOUNT SET LAST_MODIFIED = SYSDATE; updates the LAST_MODIFIED column to the current system time. select to_char(sysdate, 'MM-DD-YYYY HH24:MI:SS') N... prints the current date & time.
Created by Dr. Xi on February 06, 2012 12:14:11    Last update: February 07, 2012 15:39:35
Oracle sqlplus command line tools does not support command line editing out-of-the-box. But on Linux there's a handy utility that enables command line editing with any command line tool: rlwrap - readline wrapper. Install rlwrap: $ sudo apt-get install rlwrap Create a keywords file .sql.dict (optional, but convenient): false null true access add as asc begin by chec... It would be nice to add the tables names also. Create an alias for sqlplus (put it in .bashrc ): alias sqlplus='rlwrap -f $HOME/.sql.dict sqlplus'
Created by Dr. Xi on September 13, 2008 20:52:47    Last update: September 15, 2008 23:04:35
The text source of the stored objects (including stored procedures) are made available in Oracle by three views: USER_SOURCE describes the text source of the stored objects owned by the current user. This view does not display the OWNER column. ALL_SOURCE describes the text source of the stored objects accessible to the current user. DBA_SOURCE describes the text source of all stored objects in the database. These are the columns: Column Name Description OWNER Owner of the object NAME Name of the object TYPE Type of object: FUNCTION, JAVA SOURCE, PACKAGE, PACKAGE BODY, PROCEDURE, TRIGGER, TYPE, TYPE BODY LINE Line number of this line of source TEXT Text source of the stored object If you want to search for a certain keyword in the source,...
Created by Dr. Xi on August 11, 2007 23:19:26    Last update: August 12, 2007 01:39:33
For SQL Server 2000 and above, there are three functions: SELECT @@IDENTITY When a record is inserted into a table with a identity column, the function @@IDENTITY returns the last identity value that was inserted in the database on the same open connection. If a trigger adds a record into another table, which happens to have an identity column, @@IDENTITY will now return this value instead. SELECT IDENT_CURRENT('tablename') This will give you the most recent identity value for the given table regardless of who inserted it. SELECT SCOPE_IDENTITY() SCOPE_IDENTITY shows the most recently inserted IDENTITY in the current scope (which ignores any triggers that might fire). For SQL Server version prior to 2000, it is customary to use a stored procedure: CREATE PROCEDURE myProc @param1 INT AS......