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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
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 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 - 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