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2. sql - How to do a Select in a Select - Stack Overflow

   stackoverflow.com/questions/760950

   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.

3. SQL asterisk(*) all possible uses - Stack Overflow

   stackoverflow.com/questions/61187871

   Select * from Customers; Select Count(*) from Customers; Select Customers.quantity * Customers.price from Customers; I've searched all over the internet but didn't find any other use case. Also, the scenarios where we can use * with a column in select query. Edit: Ok as @Lucas Eder requested to know my use-case, here it is. I've got a program ...

4. How do I perform an IF...THEN in an SQL SELECT?

   stackoverflow.com/questions/63447

   So for example if a product is obsolete but you dont know if product is instock then you dont know if product is saleable. You can write this three-valued logic as follows: SELECT CASE. WHEN obsolete = 'N' OR instock = 'Y' THEN 'true'. WHEN NOT (obsolete = 'N' OR instock = 'Y') THEN 'false'. ELSE NULL. END AS saleable.

5. Using If else in SQL Select statement - Stack Overflow

   stackoverflow.com/questions/13526592

   Here, using CASE Statement and find result: select (case when condition1 then result1. when condition2 then result2. else result3. end) as columnname from tablenmae: For example: select (CASE WHEN IDParent< 1 then ID. else IDParent END) as columnname. from tablenmae.

6. sql server - SQL select from a select query - Stack Overflow

   stackoverflow.com/questions/54889377

   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 = t.book_name inner join usr on usr_book_id = book_id -- guess order by n.nb ...

7. sql - The difference between SELECT - Stack Overflow

   stackoverflow.com/questions/43009227

   1. Just for kicks and giggles, I put the SELECT .* into SQL Server and it gave me Invalid column prefix '': No table name specified - you can, however, use a table alias so that it's SELECT a.*, [column list from table b] with a proper JOIN. – ahwm.

8. sql - Using a SELECT statement within a WHERE clause - Stack...

   stackoverflow.com/questions/6424301

   There's a much better way to achieve your desired result, using SQL Server's analytic (or windowing) functions. SELECT DISTINCT Date, MAX(Score) OVER(PARTITION BY Date) FROM ScoresTable. If you need more than just the date and max score combinations, you can use ranking functions, eg: SELECT *. FROM ScoresTable t.

9. SQL "select where not in subquery" returns no results

   stackoverflow.com/questions/1406215

   1. 2. LEFT JOIN / IS NULL and NOT EXISTS will return 3, NOT IN will return nothing (since it will always evaluate to either FALSE or NULL). In MySQL, in case on non-nullable column, LEFT JOIN / IS NULL and NOT IN are a little bit (several percent) more efficient than NOT EXISTS.

10. select - SQL WHERE ID IN (id1, id2, ..., idn) - Stack Overflow

    stackoverflow.com/questions/5803472

    Doing the SELECT * FROM MyTable where id in command on an Azure SQL table with 500 million records resulted in a wait time of > 7min! Doing this instead returned results immediately: select b.id, a.* from MyTable a join (values (250000), (2500001), (2600000)) as b(id) ON a.id = b.id Use a join.

11. SQL SELECT from multiple tables - Stack Overflow

    stackoverflow.com/questions/1416003

    Sep 12, 2009 at 20:20. There's no name2 column in either CUSTOMER table - you need to rearrange the customer name columns, swapping for null to match the desired output. Once that's done, you do provide an alternative to the LEFT JOINs most of us came up with. – OMG Ponies. Sep 12, 2009 at 20:20.