Suppose that I have a database which name is testdb in test server. I also have a database named proddb in prod server. Now I want to select data of a table of testdb database from proddb database....

SELECT name, email, COUNT(*) FROM users GROUP BY name, email HAVING COUNT(*) > 1 Simply group on both of the columns. Note: the older ANSI standard is to have all non-aggregated columns in the GROUP BY but this has changed with the idea of "functional dependency": In relational database theory, a functional dependency is a constraint between two sets of attributes in a relation from a database ...

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.

I need to run a select statement that returns all rows where the value of a column is not distinct (e.g. EmailAddress). For example, if the table looks like below: CustomerName EmailAddress A...

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...

10 Doing the SELECT * FROM MyTable where id in () command on an Azure SQL table with 500 million records resulted in a wait time of > 7min! Doing this instead returned results immediately: select b.id, a.* from MyTable a join (values (250000), (2500001), (2600000)) as b(id) …

Jul 21, 2012 · Python's select() gets passed through as a select() system call as you are expecting, but the problem you have with it blocking is a different issue, probably relating to buffering. Just to satify yourself that select() is doing the right thing, try reading/writing a file on the file system rather than using a special device such as a joystick. You probably want to change your open() call ...

Dec 20, 2017 · This Stack Overflow thread discusses the possibility of adding an option separator for select elements in HTML and provides insights from developers.

Mar 19, 2019 · Learn how to select a drop-down menu value using Selenium and Python with this guide.

SELECT distinct idCustomer FROM reservations WHERE DATEPART ( hour, insertDate) < 2 and idCustomer is not null Make sure your list parameter does not contain null values. Here's an explanation: WHERE field1 NOT IN (1, 2, 3, null) is the same as: WHERE NOT (field1 = 1 OR field1 = 2 OR field1 = 3 OR field1 = null) That last comparision evaluates to null. That null is OR'd with the rest of the ...