What is the difference between SQL, PL-SQL and T-SQL?
Jun 25, 2009 · SQL is a declarative language to operate on relational data: tables, views, resultsets and similar. It's more or less standardized, and used by almost all relational database management …
Is there any difference between "!=" and "<>" in Oracle Sql?
May 18, 2012 · I would like to know if there are any differences in between the two not equal operators <> and != in Oracle. Are there cases where they can give different results or different performance?
SQL Server VS Oracle - Stack Overflow
I'm studying SQL Server but don't know much about Oracle. Can anyone give me a fair comparison of them? I've read a comparison about SQL Server 2000 vs Oracle 9i, but it's a little out of date. Hav...
sql - Oracle Joins - Comparison between conventional syntax VS ANSI ...
Sep 19, 2013 · SQL will not start to perform better after migration to ANSI syntax - it's just different syntax. Oracle strongly recommends that you use the more flexible FROM clause join syntax shown …
IN vs OR in the SQL WHERE clause - Stack Overflow
Jun 19, 2010 · When dealing with big databases, which performs better: IN or OR in the SQL WHERE clause? Is there any difference about the way they are executed?
oracle database - difference between ON Clause and using clause in …
May 3, 2012 · 23 I am doing some assignment related to joins in oracle. In some point I stucked i.e. what is the difference between USING and ON clause. I know that using ON clause we are able to …
sql - Oracle Differences between NVL and Coalesce - Stack Overflow
Jun 4, 2009 · Are there non obvious differences between NVL and Coalesce in Oracle? The obvious differences are that coalesce will return the first non null item in its parameter list whereas nvl only …
What is the Difference between SQL and SQL*Plus? [closed]
Mar 19, 2013 · 2 SQL Plus, the primary interface to the Oracle Database server, provides a powerful yet easy-to-use environment for querying, defining, and controlling data. SQL Plus delivers a full …
sql - What is the difference between "||" operator and concat function ...
Jul 9, 2012 · Would it be possible to explain the difference between the concat() function and the || operator in Oracle? Which one is better in terms of performance?
What's the difference between 'not in' and 'not exists'?
Nov 9, 2009 · The most important difference is the handling of nulls. Your query might seem to work the same with both in and exists, but when your sub-query returns null you might get a shock. You might …