SAMPLE 3 Should I use CASE instead? if so, why? How? Any other way better than the ones above? is this a good practice? see // and so on. Dans cette base il y a une table contenant les achats, cette table contient le nom des produits, le prix unitaire, la quantité achetée et une colonne consacrée à une marge fictive sur certains produits. I was told that the best practice is to use a stored procedure instead of having the sql string on the asp.net application. Pour présenter le CASE dans le langage SQL il est possible d’imaginer une base de données utilisées par un site de vente en ligne.
String sql = "Select field1, field2, field3 from Table" and blah blah. What is a CASE expression Its simply a way of telling SQL Server, I want you, for this column, to evaluate a list of conditions, and as soon as you.
#Sql server case code#
With that said, I was using inline code eg. I got a web page application that will allow the user to search customer info based on two joined tables. WHERE EXISTS(SELECT 1 FROM dbo.I'm trying to determine what's the best way to have multiple if/else statments in a stored procedure.
#Sql server case how to#
How to check if Temp table exists EXAMPLE 3: Using EXISTS clause in the WHERE clause to check the existence of a record DECLARE INT = 1 SELECT (CASE WHEN EXISTS(SELECT 1 FROM dbo.Customer WITH(NOLOCK)ĮLSE 'Record doesn''t Exists' END) AS
How to check if a Table exists EXAMPLE 2: Using EXISTS clause in the CASE statement to check the existence of a record DECLARE INT = 2 IF EXISTS(SELECT 1 FROM dbo.Customer WITH(NOLOCK) How to check if a Database exists EXAMPLE 1: Using EXISTS clause in the IF statement to check the existence of a recordīelow example script checks the existence of the customer record with CustId = 2 in the IF statement DECLARE INT = 2 Once, either IF T-SQL statements or ELSE T-SQL statement is executed, then other unconditional T-SQL statements continues execution. If the condition evaluates to False, then T-SQL statements followed by ELSE keyword will be executed. Insert sample records into Customer table If the condition evaluates to True, then T-SQL statements followed by IF condition in SQL server will be executed. (OrderId INT, CustId INT, OrderTotal Money) Also read about Nested Case Statements in SQL Server. To demonstrate this let us create a Customer and Order table as shown in the below image by the following script: In SQL scripting, we can use Case expressions or Case Statements as you may call them, to create a derived column based on a condition.