sql - How to do a Select in a Select - Stack Overflow
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 points to a dataset that …
Is there an <option> separator for <select> elements?
This Stack Overflow thread discusses the possibility of adding an option separator for select elements in HTML and provides insights from developers.
mysql - SELECT * WHERE NOT EXISTS - Stack Overflow
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 details, …
A select query selecting a select statement - Stack Overflow
Jan 11, 2010 · A select query selecting a select statement Asked 16 years, 1 month ago Modified 16 years, 1 month ago Viewed 291k times
What does it mean `SELECT 1 FROM table`? - Stack Overflow
SELECT 1 FROM table What does this 1 mean, how will it be executed, and what will it return? Also, in what type of scenarios can this be used?
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...
Oracle SQL - select within a select (on the same table!)
Oracle SQL - select within a select (on the same table!) Asked 15 years, 5 months ago Modified 9 years, 5 months ago Viewed 142k times
sql - Why is SELECT * considered harmful? - Stack Overflow
Sep 4, 2010 · Why is SELECT * bad practice? Wouldn't it mean less code to change if you added a new column you wanted? I understand that SELECT COUNT(*) is a performance problem on some DBs, …
Is there an onSelect event or equivalent for HTML <select>?
<select onChange="javascript:doSomething();"> <option>A</option> <option>B</option> <option>C</option> </select> Now, doSomething() only gets triggered when the selection changes. I …
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 ...