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Is there an onSelect event or equivalent for HTML lt;select gt;? @T J Crowder You are correct -- not sure what I was thinking when I wrote the second half I've deleted the original comment and for the purpose of not confusing others, here is the original comment (please note that the first half is correct, and the second part is wrong): This will not work as expected for the first option which has index 0: 0 is false in JS so doSomething() will not be
sql - How to do a Select in a Select - Stack Overflow 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 WHERE o Ref IS NULL
sql server - SQL select from a select query - Stack Overflow I want to do a select request that perform a first select and then use that selection to perform a second select I made a 1st version using a temp table but I would like to know if there is a way to do it without the temporary table my code with the temp table is like :
mysql - SELECT * WHERE NOT EXISTS - Stack Overflow SELECT * FROM employees e WHERE NOT EXISTS ( SELECT null FROM eotm_dyn d WHERE d employeeID = e id ) You can join these tables with a LEFT JOIN keyword and filter out the NULL's, but this will likely be less efficient than using NOT EXISTS
sql - Case in Select Statement - Stack Overflow Using a SELECT statement with a searched CASE expression 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
sql - Select * from subquery - Stack Overflow SELECT a,b, a+b AS total_sum FROM ( SELECT SUM(column1) AS a, SUM(column2) AS b FROM table ) I have really lot of columns to return so I do not want to write the column names again in the main query
What does it mean `SELECT 1 FROM table`? - Stack Overflow SELECT * FROM TABLE1 T1 WHERE EXISTS ( SELECT 1 FROM TABLE2 T2 WHERE T1 ID= T2 ID ); Basically, the above will return everything from table 1 which has a corresponding ID from table 2 (This is a contrived example, obviously, but I believe it conveys the idea
sql - select * vs select column - Stack Overflow Select column is more performatic of select *, but if you is developing an oriented object system, then you will like use object properties and you can need a properties in any part of apps, then you will need write more methods to get properties in special situations if you don't use select * and populate all properties
Exclude a column using SELECT * [except columnA] FROM tableA? We all know that to select all columns from a table, we can use SELECT * FROM tableA Is there a way to exclude column(s) from a table without specifying all the columns? SELECT * [except columnA]