Dec 18, 2014 · 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 poi
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 loo
Jan 18, 2012 · 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 co
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 netw
SELECT * from employees WHERE NOT EXISTS (SELECT name FROM eotm_dyn) So basically I have one table with a list of employees and their details. Then another table with some other de
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