Sql if exists else


The following is a SELECT statement that uses the EXISTS condition: SELECT * FROM Description. This gives you a clean, Dec 11, 2012 Well I would like to comment on further aspect of using if-else with exists . The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement. It can be a full or partial plan, specified in the abstract plan language. else constructs. select case when c. If we refer to the Books Online documentation, it gives examples that are similar to: IF EXISTS (SELECT * FROM Jan 29, 2012 When coming from a programming background, it's natural to want to frame conditional operations within the familiar if. It's best to avoid using if-else with exists . Dec 7, 2016 If you must do it this way then this is the syntax you're after; IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') BEGIN SELECT 1 END ELSE BEGIN SELECT 2 END Feb 17, 2008 This is a pretty common situation that comes up when performing database operations. Data end Description. You then create a dummy temp table with the value you are looking for, and left outer join on the actual data. Data end This SQL Server tutorial explains how to use the EXISTS condition in SQL Server (Transact-SQL) with syntax and examples. Say you want to insert Dec 11, 2012 Well I would like to comment on further aspect of using if-else with exists . . Dec 19, 2014 But for that you need to return a row in case the config name doesn't exist. Name is null then 'Default Value' else c. The technique below is based on a common scenario. plan "abstract plan". If any records exist that match the criteria it returns true, otherwise it returns false. What I am basically trying to do is-. A stored procedure is called and the data needs to be updated if it already exists and inserted if it does not. It is used in combination with a subquery and is considered to be met if the subquery returns at least one row. The EXISTS function takes one parameter which is a SQL statement. So that in turn implies you need a left outer join. Have been coding Oracle and want some help with this. If the expression contains a select statement, you must enclose the select statement in parentheses. This gives you a clean, Hi, I am very new to SQL Server. SQL server doesn't like it when i tried to set the identity in the condition. Why? You need to make sure at least one record exists in your table; This method does not allow for concurrency (specially in insert , updates transactions, it could end up creating deadlock). If a value doesn't already exist, then set identity on and insert, else, set identity off and insert. Plans can be specified only for optimizable SQL statements, that is, select . Dec 11, 2012 Well I would like to comment on further aspect of using if-else with exists . Say you want to insert Oct 12, 2003 if EXISTS (select * from authors where au_id = '172-32-1176') Print 'Record exits - Update' ELSE Print 'Record doesn''t exist - Insert'. How can I Dec 11, 2012 Well I would like to comment on further aspect of using if-else with exists . Oct 12, 2003 if EXISTS (select * from authors where au_id = '172-32-1176') Print 'Record exits - Update' ELSE Print 'Record doesn''t exist - Insert'. This happens in a lot of SQL code I have worked with (and I used to be a contributor also). specifies the abstract plan to use to optimize the query