sql - How to do a Select in a Select - Stack Overflow
WEBApr 17, 2009 · 22. 3 ways. SELECT * FROM YourTable y WHERE NOT EXISTS. (SELECT * FROM OtherTable o WHERE y.Ref = o.Ref) SELECT * FROM YourTable WHERE Ref NOT IN. (SELECT Ref FROM OtherTable WHERE Ref IS NOT NULL) SELECT y.*. FROM YourTable y. LEFT OUTER JOIN OtherTable o ON y.Ref = o.Ref.
How do I perform an IF...THEN in an SQL SELECT?
WEBSep 15, 2008 · Sorted by: 2052. The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. SELECT CAST ( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product. You only need to use the CAST operator if you want the result as a Boolean value. If you are happy with …
sql server - SQL select from a select query - Stack Overflow
WEBFeb 26, 2019 · In sql you can use a sub-query, like this: select top 10 usr.usr_smthg, t.book_name, usr.dvd_name from ( select dvd_name, book_name , count(*) nb from usr inner join book on usr_book_id = book_id inner join dvd on dvd_id = usr_dvd_id group by dvd_name, book_name having count(*) > 1 ) t inner join book b on b.book_name = …
Nested select statement in SQL Server - Stack Overflow
WEB75. The answer provided by Joe Stefanelli is already correct. SELECT name FROM (SELECT name FROM agentinformation) as a. We need to make an alias of the subquery because a query needs a table object which we will get from making an alias for the subquery. Conceptually, the subquery results are substituted into the outer query.
database - How to select unique records by SQL - Stack Overflow
WEBOption 4: Common Table Expression with ROW_NUMBER () In the Common Table Expression (CTE), select the ROW_NUMBER (), partitioned by the group column and ordered in the desired order. Then SELECT only the records that have ROW_NUMBER() = 1: WITH CTE AS (. SELECT *. ,row_number() OVER(PARTITION BY word, num …
How do I UPDATE from a SELECT in SQL Server? - Stack Overflow
WEBFeb 25, 2010 · update uno set col1=d.col1,col2=d.col2 from uno. inner join dos d on uid=did where [sql]='cool'. select * from uno. select * from dos. If the ID column name is the same in both tables then just put the table name before the table to be updated and use an alias for the selected table, i.e.:
SQL conditional SELECT - Stack Overflow
WEBMay 13, 2013 · In SQL, you do it this way: SELECT CASE WHEN @selectField1 = 1 THEN Field1 ELSE NULL END, CASE WHEN @selectField2 = 1 THEN Field2 ELSE NULL END. FROM Table. Relational model does not imply dynamic field count. Instead, if you are not interested in a field value, you just select a NULL instead and parse it on the client.
sql - How to Select Every Row Where Column Value is NOT …
WEBConsidering the same table this could give the result. SELECT EmailAddress, CustomerName FROM Customers as a. Inner Join Customers as b on a.CustomerName <> b.CustomerName and a.EmailAddress = b.EmailAddress. For still better results I would suggest you to use CustomerID or any unique field of your table.
What does it mean `SELECT 1 FROM table`? - Stack Overflow
WEB152. SELECT 1 FROM TABLE_NAME means, "Return 1 from the table". It is pretty unremarkable on its own, so normally it will be used with WHERE and often EXISTS (as @gbn notes, this is not necessarily best practice, it is, however, common enough to be noted, even if it isn't really meaningful (that said, I will use it because others use it and it ...
sql - Case in Select Statement - Stack Overflow
WEBJan 7, 2013 · Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values. The following example displays the list price as a text comment based on the price range for a product. USE AdventureWorks2012; GO. SELECT ProductNumber, Name, "Price Range" =. CASE.