How to do a Select in a Select - Stack Overflow
Apr 17, 2009 · 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...
Is there an onSelect event or equivalent for HTML <select>?
Another option could be to use onblur on the select. This will fire anytime the user clicks away from the select. At this point you could determine what option was selected. To have this even trigger at the correct time, the onclick of the option's could blur the field (make something else active or just .blur () in jQuery).
What does it mean `SELECT 1 FROM table`? - Stack Overflow
Jun 13, 2024 · select 1 from table will return the constant 1 for every row of the table. It's useful when you want to cheaply determine if record matches your where clause and/or join.
sql server - SQL select from a select query - Stack Overflow
Mar 6, 2019 · 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 server - Select with (nolock) - Stack Overflow
May 5, 2014 · SELECT statements do indeed apply locks unless there is a statement at the top of the query SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED. By all means use WITH (NOLOCK) in SELECT statement on tables that have a clustered index, but it would be wiser to only do so if there's a need to.
sql - How to rename columns with `SELECT`? - Stack Overflow
Mar 5, 2009 · I have two tables with one identical column name, but different data. I want to join the tables, but access both columns (row["price"], row["other_price"]): How can I rename/alias one of them in the
sql - Case in Select Statement - Stack Overflow
Jan 7, 2013 · 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.
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.
How to select unique records by SQL - Stack Overflow
When I perform SELECT * FROM table I got results like below: 1 item1 data1 2 item1 data2 3 item2 data3 4 item3 data4 As you can see, there are dup records from column2 (item1 are dupped). So how co...
How can I set the default value for an HTML <select> element?
Aug 19, 2010 · Learn how to set the default value for an HTML <select> element using JavaScript or HTML techniques.