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
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
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
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
Is there an lt;option gt; separator for lt;select gt; elements? what most of the solutions here that employ optgroup are missing is the fact that a non-empty label attribute is required as per the html specification; therefore I would opt for one of the disabled option approaches
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
sql - Select * from subquery - Stack Overflow You can select every column from that sub-query by aliasing it and adding the alias before the *: SELECT t *, a+b AS total_sum FROM ( SELECT SUM(column1) AS a, SUM(column2) AS b FROM table ) t