The key to using simple CASE statements effectively is understanding how to compare an expression to fixed values.The expression in a simple CASE statement can be a column name, a function, or any valid SQL expression. The values in the WHEN clauses are the fixed values against which we wan...
JOIN dbSecurity.dbo.AccountInstSecurityRole s ON s.InstitutionID = CASE WHEN (RecordCount) <= 1 THEN v.ParentInstitutionID ELSE v.InstitutionID END Here is the full example USE dbTechnikons -- Gets all the child records for the intitution SELECT v.InstitutionID, v.Name, v.HierarchyLevelID...
Using searched CASE expressions and nested subqueries in SELECT statements very complex processing can be accomplished with a single SQL statement. Consider, once again, the sample pubs database. The following query checks the royalty percentage by title and places the percentage into a category based...
And that is how SQL Case statement is used in an Order by clause: Here’s another example with the SQL Where Case. This might not be a good SQL Where Case statement because the query below does not make any sense, right? 1 2 3 SELECT * FROM Production.Product p WHERE 1 = ...
Your query, once a tangled incantation, now yields to the treasures you seek. But for that, it is important for you to know the kind of optimization you are looking for. A few examples of query optimization are listed below. For readers who are veterans in SQL development, can skip the...
Age calculation in report builder query Aggregated CASE expressions versus the PIVOT operator… Is one better than the other? Aging Report SQL Query Alias all columns in a given table Alias column with variable value in SQL Script All MonthNames and Month numbers in sql server All queries comb...
in practice I have a form where there is a checkbox of type true / false.In this form there is a grid containing a sql query to return records from my BO table.What I want is when my checkbox equals True, the query returns only the records in the grid where the logi1 field of ...
Note: Oracle internally creates unique index to prevent duplication in the column values.Indexes would be discussed later in PL/SQL.CREATE TABLE TEST ( ... , NAME VARCHAR2(20) CONSTRAINT TEST_NAME_UK UNIQUE, ... );In case of composite unique key,it must be defined at table level as ...
select CASE WHEN 1=1 then 'Equal' else 'not equal' end --or select CASE 1 WHEN 1 then 'Equal' else 'not equal' end --this throws error select CASE 1 WHEN 1=1 then 'Equal' else 'not equal' end Please use Marked as Answer if my post solved your problem and use Vote As Helpfu...
Example 2-2 Finding User Accounts That Use Case-Insensitive (10G) Version Log in to SQL*Plus as an administrative user, and enter the following SQL query: SELECT USERNAME,PASSWORD_VERSIONS FROM DBA_USERS; The following result shows password versions for the accounts: ...