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sql - How to do a Select in a Select - Stack Overflow I have a table containing a unique ID field Another field (REF) contains a reference to another dataset's ID field Now I have to select all datasets where REF points to a dataset that doesn't exi
A select query selecting a select statement - Stack Overflow SELECT TypesAndBread Type, TypesAndBread TBName, (SELECT Count(Sandwiches [SandwichID]) As SandwichCount FROM Sandwiches WHERE Sandwiches [TypesAndBread Type] = Sandwiches [TypesAndBread TBName]) As SandwichCount FROM TypesAndBread; But of course this doesn't work I didn't think it will, just thought of giving it a try I was thinking of maybe constructing the query with VBA when they open
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 - is there is a wa
Is there an onSelect event or equivalent for HTML lt;select gt;? <select onChange="javascript:doSomething();"> <option>A< option> <option>B< option> <option>C< option> < select> Now, doSomething() only gets triggered when the selection changes I want to trigger doSomething() when the user selects any option, possibly the same one again I have tried using an "onClick" handler, but that gets triggered before the user starts the selection process So, is
sql - select * vs select column - Stack Overflow If I just need 2 3 columns and I query SELECT * instead of providing those columns in select query, is there any performance degradation regarding more less I O or memory? The network overhead mig
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 Is there any easy solution? I cannot use a+b in the inner query because there are not known at this place
The difference between SELECT * and SELECT A. * [closed] Just for kicks and giggles, I put the SELECT * into SQL Server and it gave me Invalid column prefix '': No table name specified - you can, however, use a table alias so that it's SELECT a *, [column list from table b] with a proper JOIN
c - Why is select used in Linux - Stack Overflow The first argument to select() is known as nfds and POSIX says: The nfds argument specifies the range of descriptors to be tested The first nfds descriptors shall be checked in each set; that is, the descriptors from zero through nfds-1 in the descriptor sets shall be examined So, to test a file descriptor n, the value in nfds must be at
sql - MySQL SELECT only not null values - Stack Overflow Is it possible to do a select statement that takes only NOT NULL values? Right now I am using this: SELECT * FROM table And then I have to filter out the null values with a php loop Is there a