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
Apr 17, 2009 · 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
Is there an onSelect event or equivalent for HTML <select>?
@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 …
Is there an <option> separator for <select> elements?
Dec 20, 2017 · 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
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 …
How to select unique records by SQL - Stack Overflow
When I perform SELECT * FROM table I got results like below: 1 item1 data1 2 item1 data2 3 item2 data3 4 item3 data4 As you can see, there are dup records from column2 (item1 are dupped). So how co...
How can I set the default value for an HTML <select> element?
Aug 19, 2010 · Learn how to set the default value for an HTML <select> element using JavaScript or HTML techniques.
sql - How do I use ROW_NUMBER ()? - Stack Overflow
Jun 7, 2009 · SELECT max(ROW_NUMBER() OVER(ORDER BY UserId)) FROM Users but it didn't seem to work... To get ROW_NUMBER() using a given piece of information, ie. if I have a name and I want to know what row the name came from. I assume it would be something similar to what I tried for #1. SELECT ROW_NUMBER() OVER(ORDER BY UserId) From Users …
Change <select>'s option and trigger events with JavaScript
Oct 12, 2013 · How can I change an HTML <select>'s option with JavaScript (without any libraries like jQuery), while triggering the same events as if a user had made the change? For example using following ...
sql - Case in Select Statement - Stack Overflow
Jan 7, 2013 · 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.