What does it mean `SELECT 1 FROM table`?

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?

2024 Mar 22

sql

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

2024 Dec 22

mysql

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

2024 Jun 17

sql

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

2024 May 02

A select query selecting a select statement

A select query selecting a select statement Asked 15 years, 11 months ago Modified 15 years, 11 months ago Viewed 290k times

2024 Mar 09

sql server

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.

2025 Feb 04

How can I set the default value for an HTML <select> element?

The function first tries to find the <select> with the id, then it will search for the value_selected in the <select> options and if it finds it, it will set the selected attribute returning

2025 Sep 15

Oracle SQL

Oracle SQL - select within a select (on the same table!) Asked 15 years, 4 months ago Modified 9 years, 3 months ago Viewed 142k times

2024 Dec 25

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.

2025 May 20

sql

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

2025 Mar 26

View/Download How to Select DC Power for Mobile Energy Storage Containers [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.