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The SQLCASEstatement evaluates a list of conditions and adds a column with values based on the condition. For example, -- add a new column 'order_volume' in the Orders table-- and flag any order greater than 10000 as 'Large Order'-- and smaller than 10000 as 'Small Order'SELECT*,CASE...
NULLIF Function NULLIF returns NULL if its two arguments are equal, otherwise, it returns the first argument: SELECT NULLIF(column, 'value_to_compare') FROM table_name; It can serve as a simpler alternative to CASE in some scenarios. Conclusion The CASE expression is an indispensable tool in...
or a customer. The function returns the first and last name of a givenBusinessEntityIDand the contact type for that person. TheCASEexpression in the SET statement determines the value to display for the columnContactTypebased on the existence of theBusinessEntityIDcolumn in theEmployee,Vendor, ...
DECODE is considered the most powerful function in Oracle. Oracle 8i release introduced the CASE expression. The CASE expression can do all that DECODE does plus lot of other things including IF-THEN analysis, use of any comparison operator and checking multiple conditions, all in a SQL query ...
SQL USEAdventureWorks2022; GOCREATEFUNCTIONdbo.GetContactInformation (@BusinessEntityIDINT)RETURNS@retContactInformationTABLE( BusinessEntityIDINTNOTNULL, FirstNameNVARCHAR(50)NULL, LastNameNVARCHAR(50)NULL, ContactTypeNVARCHAR(50)NULL, PRIMARYKEYCLUSTERED (BusinessEntityIDASC) )AS-- Returns the first name...
CREATE FUNCTION dbo.GetContactInformation(@BusinessEntityID int) RETURNS @retContactInformation TABLE ( BusinessEntityID int NOT NULL, FirstName nvarchar(50) NULL, LastName nvarchar(50) NULL, ContactType nvarchar(50) NULL, PRIMARY KEY CLUSTERED (BusinessEntityID ASC) ...
Learn how to use the XQuery function upper-case(), that converts characters to their upper case equivalent.
The CASE expression is a conditional expression, similar to if/then/else statements found in other languages. CASE is used to specify a result when there are multiple conditions. Use CASE where a SQL expression is valid, such as in a SELECT command. There are two types of CASE expressions:...
The COALESCE function will go through the list of expressions (in this case columns and constants) and return the first non-NULL value encountered. In this case, the numeric constant 0 is added at the end of the list to provide a default value if all of the columns should happen to be...