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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 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 :
  • 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
  • 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
  • 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
  • html select - Get selected value in dropdown list using JavaScript . . .
    Learn how to retrieve the selected value from a dropdown list using JavaScript
  • database - 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
  • HTML Form: Select-Option vs Datalist-Option - Stack Overflow
    Think of it as the difference between a requirement and a suggestion For the select element, the user is required to select one of the options you've given For the datalist element, it is suggested that the user select one of the options you've given, but he can actually enter anything he wants in the input





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