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Apr 3, 2009 · 10.5k2171105. 10 Answers. Sorted by: 75. You can use "having" instead of "where". SELECT SUBSTRING (Column1, 1, 4) + SUBSTRING (Column1, 4, 3) AS Col1 FROM MyTable HAVING Col1 = 'MySearch'. Having do a "where" after execution of the query. Be careful to use it in the right conditions to have no performance problem.
Aug 25, 2015 · 0. If you write only equal condition just: Select Case columns1 When 0 then 'Value1' when 1 then 'Value2' else 'Unknown' End. If you want to write greater , Less then or equal you must do like this: Select Case When [ColumnsName] >0 then 'value1' When [ColumnsName]=0 Or [ColumnsName]<0 then 'value2' Else 'Unkownvalue' End.
Mar 21, 2017 · The easiest way I can think of is to have a table variable or CTE; create your lookup as rows and join to it. Something like this: select 1 as emp_code, 'value1' as emp_title. union. select 2 as emp_code, 'value2' as emp_title. union. select 3 as emp_code, 'value3' as emp_title. select cte.emp_code, tableName.*.
Here is an example from their tutorial: SELECT po.OrderID, p.LastName, p.FirstName. FROM Persons AS p, Product_Orders AS po. WHERE p.LastName='Hansen' AND p.FirstName='Ola'. Regarding using the Alias further in the query, depending on the database you are using it might be possible. edited Aug 17, 2014 at 9:21.
Nov 12, 2010 · 13. The AS keyword is to give an ALIAS name to your database table or to table column. In your example, both statement are correct but there are circumstance where AS clause is needed (though the AS operator itself is optional), e.g. SELECT salary * 2 AS "Double salary" FROM employee;
YourValues NVARCHAR(100) } --Insert your data into the temp table. INSERT INTO #TempTable(YourValues) SELECT yt.Column1 as YourColumnOne FROM YourTable yt. --Query the filtered data based on the aliased column. SELECT *. FROM #TempTable. WHERE YourColumnOne = 'DataToFilterOn'.
In the case of nested tables, some DBMS require to use an alias like MySQL and Oracle but others do not have such a strict requirement, but still allow to add them to substitute the result of the inner query. Your wording suggest there is such a requirement for both Oracle and MySQL.
There are two reasons for using table aliases. The first is cosmetic. The statements are easier to write, and perhaps also easier to read when table aliases are used. The second is more substantive. If a table appears more than once in the FROM clause, you need table aliases in order to keep them distinct.
Jul 22, 2015 · 5. You would have to use a quoted identifier: select id as "#",first_name,last_name from student. You are allowed a # in an unquoted object name (which includes aliases), from object naming rule 7: Nonquoted identifiers can contain only alphanumeric characters from your database character set and the underscore (_), dollar sign ($), and pound ...
Every derived table (AKA sub-query) must indeed have an alias. I.e. each query in brackets must be given an alias (AS whatever), which can the be used to refer to it in the rest of the outer query. SELECT ID FROM ( SELECT ID, msisdn FROM ( SELECT * FROM TT2 ) AS T ) AS T
