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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 - 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
mysql - SELECT * WHERE NOT EXISTS - Stack Overflow SELECT * from employees WHERE NOT EXISTS ( SELECT name FROM eotm_dyn WHERE eotm_dyn employeeid = employees employeeid ) assuming that the two tables are linked by a foreign key relationship At this point you could use a variety of other options including a LEFT JOIN The optimizer will typically handle them the same in most cases, however
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
sql - How to select only the first rows for each unique value of a . . . In the table, one customer like John Smith can have multiple addresses I need the SELECT query for this table to return only first row found where there are duplicates in 'CName' For this table it should return all rows except the 3rd (or 1st - any of those two addresses are okay but only one can be returned) Is there a keyword I can add to the SELECT query to filter based on whether the
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