SQL Server IF EXISTS THEN 1 ELSE 2
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Using Sql Server 2012. I have a stored procedure and part of it checks if a username is in a table. If it is, return a 1, if not, return a 2. This is my code:
IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') 1 else 2
However, I keep receiving the below error:
Incorrect syntax near '1'.
Is this even possible with an IF EXIST?
If you want to 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
You don't strictly need the
BEGIN..END statements but it's probably best to get into that habit from the beginning.
Overview of the T-SQL If Exists statement in a SQL Server database, IF EXISTS in SQL Server 2016 to SQL Server 2019 In case the object does not exist, and you try to drop, you get the following error. IF EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'vwABC') In this article, we explored two different versions of T-SQL IF Exists statements. The above SQL query executes the below pseudo code. IF experience > 5 OR salary > 1000 THEN RETURN 'Senior Dev' ELSE RETURN 'Junior Dev' END. A case statement should have an END statement in SQL server. If then else sql server Method 2: Using IIF Logical function to write if else then in select query example: IIF is syntactic sugar for writing
How about using IIF?
SELECT IIF (EXISTS (SELECT 1 FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx'), 1, 2)
Also, if using EXISTS to check the the existence of rows, don't use *, just use 1. I believe it has the least cost.
exist (select * from my table), exist (select * from my table) � sql-server performance t-sql. My colleague suggests that Query 1 should run faster than Query 2. If it's true� Using BEGIN and END helps SQL server to identify statement block that needs to be executed and separate it from rest of the T-SQL statements which are not part of IF…ELSE T-SQL block. ELSE is optional. IF…ELSE with the only numeric value in Boolean Expression. Condition: TRUE IF (1=1) PRINT 'IF STATEMENT: CONDITION IS TRUE' ELSE PRINT 'ELSE
What the output that you need,
so use the following code:
IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') select 1 else select 2
SQL Server EXISTS By Practical Examples, The EXISTS operator returns TRUE if the subquery returns one or more rows. The following example finds all customers who have placed more than two� I know its been a while since the original post but I like using CTE's and this worked for me: WITH cte_table_a AS ( SELECT [id] [id] , MAX([value]) [value] FROM table_a GROUP BY [id] ) UPDATE table_b SET table_b.code = CASE WHEN cte_table_a.[value] IS NOT NULL THEN cte_table_a.[value] ELSE 124 END FROM table_b LEFT OUTER JOIN cte_table_a ON table_b.id = cte_table_a.id
In SQL without
SELECT you cannot result anything. Instead of
IF-ELSE block I prefer to use
CASE statement for this
SELECT CASE WHEN EXISTS (SELECT 1 FROM tblGLUserAccess WHERE GLUserName = 'xxxxxxxx') THEN 1 ELSE 2 END
SQL EXISTS Operator, SQL Server Functions The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns true if the subquery returns one or more records. 3, Aniseed Syrup, 1, 2, 12 - 550 ml bottles, 10 SQL statement returns TRUE and lists the suppliers with a product price less than 20:� As I said earlier in my previous post, count(*) can't be a negative number. It can be either 0 or > 0. Also you should be bale to use if exists, not exists to your conditions which are more optimized for performance. Also keep the dbo. before the table name for better performance and avoid sql server to do more work than necessary.
You can define a variable
@Result to fill your data in it
DECLARE @Result AS INT IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') SET @Result = 1 else SET @Result = 2
Use IFELSE Statements to Program a Stored , Use IFELSE logic in a stored procedure to selectively execute a code block. All the examples for this lesson are based on Microsoft SQL Server If you're like most casual user of T-SQL then you're you've mostly likely copied some block are run in sequence; therefore, SQL Statement 1 is run before SQL Statement 2. SQL stands for Structured Query Language. It is a powerful database computer language which was introduced in 1974. SQL is specifically designed to work with relational databases. All relational database systems such as Oracle, MySQL, MS SQL Server and others employ this standard database language. SQL is used to create, store, retrieve, change and delete […]
ifelse, Imposes conditions on the execution of a SQL statement. if 3 > 2 print "yes" Where user tables exist, the else clause prints a message and selects their for the existence of some parameter) or in ad hoc queries (see Examples 1 and 2). command occurs within an ifelse block, Adaptive Server creates the schema for � ) select 'ok' where exists (select * from admission_outside) union all select 'not ok' where not exists (select * from admission_outside) Here is a demo ;WITH CTE AS ( SELECT 1 as a WHERE 1=0 ) SELECT 'OK' WHERE EXISTS (SELECT * FROM CTE) UNION ALL SELECT 'NOT OK' WHERE NOT EXISTS (SELECT * FROM CTE)
EXISTS (Transact-SQL), The following example compares two queries that are semantically equivalent. The WHERE clause in NOT EXISTS is satisfied if no rows are� SQL Server Migration (1) SQL Server Upgrade (1) Stored Procedures (11) tempdb (3) XML (16) SQL Server Questions (41) SQL Server Versions (135) SQL Azure (4) SQL Server 2005 (7) SQL Server 2008 (5) SQL Server 2012 (33) SQL Server 2014 (18) SQL Server 2016 (49) SQL Server 2017 (20) SQL Server 2019 (2) SQL Server Express (1) T SQL (181
ELSE (IFELSE) (Transact-SQL), ELSE (IFELSE) (Transact-SQL). 03/15/2017; 3 minutes to read. +2 The following example has a simple Boolean expression ( 1=1 ) that is true and, therefore, a query as part of the Boolean expression and then executes slightly different� SELECT TOP 1 ApptDate. FROM AllApptstatus. WHERE aReferralID = cr.id. AND ApptStatus IN (-1407, -1408) ORDER BY ApptDate DESC) IS NULL THEN 'Future Appt Booked, No Previous' WHEN (SELECT TOP 1
- Using "SELECT *" vs "SELECT 1" or "SELECT 0" with EXISTS has no cost difference in SQL Server. More a matter of preference.
- This is absolutely not necessary - see this question
- @BillTür I still believe this is valid Query. Its all based on the WHERE condition. If your condition exactly matches one record then no issues. Suppose your condition matches the more number of records then it will cost. It took Compute scalar cost: 16% when I have select 1. Compute Scalar cost is: 0% when I use SELECT TOP 1 1 Hence, it makes difference based on the number of records matches