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...
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, including their name. Where there name is not in the eotm_dyn table, meaning there is no entry for them, I would like to see exactly who they are, or in other words, see what exactly is missing. The above ...
Select column is more performatic of select *, but if you is developing an oriented object system, then you will like use object.properties and you can need a properties in any part of apps, then you will need write more methods to get properties in special situations if you don't use select * and populate all properties.
<select onChange="javascript:doSomething();"> <option>A</option> <option>B</option> <option>C</option> </select> Now, doSomething() only gets triggered when the selection changes. I want to trigger doSomething() when the user selects any option, possibly the same one again. I have tried using an "onClick" handler, but that gets triggered before the user starts the selection process. So, is ...
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.
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 ...
