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- sql - MySQL SELECT only not null values - Stack Overflow
SELECT * FROM ( SELECT col1 AS col FROM yourtable UNION SELECT col2 AS col FROM yourtable UNION -- UNION SELECT coln AS col FROM yourtable ) T1 WHERE col IS NOT NULL And I agre with Martin that if you need to do this then you should probably change your database design
- 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 - 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
- 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 server - INSERT INTO vs SELECT INTO - Stack Overflow
The simple difference between select Into and Insert Into is: --> Select Into don't need existing table If you want to copy table A data, you just type Select * INTO [tablename] from A Here, tablename can be existing table or new table will be created which has same structure like table A
- 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 :
- Is there an lt;option gt; separator for lt;select gt; elements?
To build upon Jasneet's answer: Style the background of a disabled option as gray (Jasneet); Add disabled options above and below to pad the separator
- How can I set the default value for an HTML lt;select gt; element?
Learn how to set the default value for an HTML <select> element using JavaScript or HTML techniques
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