What is the meaning of ORDER BY 1/2 in SQL?
SELECT first_name, last_name FROM sales.customers ORDER BY 1, 2; In this example, 1 means the first_name column and 2 means the last_name column. Using the ordinal positions of columns in the ORDER BY clause is considered a bad programming practice for a couple of reasons.
Can you ORDER BY 2 things SQL?
Discussion: If you want to select records from a table but would like to see them sorted according to two columns, you can do so with ORDER BY . This clause comes at the end of your SQL query. Then, after a comma, add the second column (in our example, last_name ).
What does ORDER BY 3 mean in SQL?
Order by 3 DESC. In this query, column birthdate is at the 3rd position; therefore, we can use three in the Order by clause to sort results on this column data. Note: I would not recommend using column position in Order By clause.
Can we use ORDER BY for 2 columns?
If you want to select records from a table but would like to see them sorted according to two columns, you can do so with ORDER BY. This clause comes at the end of your SQL query. After the ORDER BY keyword, add the name of the column by which you’d like to sort records first (in our example, salary).
How do you order things in SQL?
The ORDER BY statement in SQL is used to sort the fetched data in either ascending or descending according to one or more columns.
- By default ORDER BY sorts the data in ascending order.
- We can use the keyword DESC to sort the data in descending order and the keyword ASC to sort in ascending order.
What does order by 5 mean in SQL?
It is the SORTING BY RELATIVE POSITION. You can use the SQL ORDER BY clause to sort by relative position in the result set, where the first field in the result set is 1. The next field is 2, and so on. Here in this case Order by 5th field in the result set.
What does 1 mean in SQL?
WHERE 1 is a synonym for “true” or “everything.” It’s a shortcut so they don’t have to remove the where clause from the generated SQL.
What does where 1 0 mean in SQL?
A query like this can be used to ping the database. The clause: WHERE 1=0. Ensures that non data is sent back, so no CPU charge, no Network traffic or other resource consumption. A query like that can test for: server availability.