Can you query columns in any order?
3 Answers. The order doesn’t matter, actually, so you are free to order them however you’d like. edit: I guess a bit more background is helpful: As far as I know, the process of optimizing any query happens prior to determining exactly what subset of the row data is being pulled.
How do I change the order of columns in SQL Developer?
Instead, just right-click on the column headers, select ‘Columns’, and reorder as desired. Then move up the columns you want to see first… Put them in the order you want – it won’t affect the database.
How do I change the order of rows in SQL?
You can change the order of the rows by adding an ORDER BY clause at the end of your query, with a column name after. By default, the ordering will be in “ascending order”, from lowest value to highest value. To change that to “descending order”, specify DESC after the column name.
Does column order matter in SQL?
Column order does not matter while creating a table. We can arrange the columns while retrieving the data from the database. Primary key can be set to any column or combination of columns.
What is ORDER BY 2 desc in SQL?
If you prefer, you can use the positions of the column in the ORDER BY clause. … SELECT name, credit_limit FROM customers ORDER BY 2 DESC, 1; In this example, the position of name column is 1 and credit_limit column is 2. In the ORDER BY clause, we used these column positions to instruct the Oracle to sort the rows.
How do you think ORDER BY sorts a column of text values by default?
In SQL, the ORDER BY keyword is used to sort results in ascending or descending order according to the values of one or more columns. By default ORDER BY will sort in ascending order.
Does order matter in SQL Select?
5 Answers. No, the order of the WHERE clauses does not matter. The optimizer reviews the query & determines the best means of getting the data based on indexes and such.
How do I rearrange columns in Oracle SQL?
Re-order columns of table in Oracle
- Rename the existing table.
- Drop the primary key constraint.
- Re-create the table with the correct column order.
- List item.
- Run INSERT INTO .. SELECT to move the data from temp to the table in step #3.
- Drop the temp table.
How do I sort in SQL Developer?
The ORDER BY keyword is used to sort the result-set in ascending or descending order. The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.
How do I change the order of a column in Oracle?
- From the View menu, select Reorder Columns.
- Reorder the columns using the Reorder Columns dialog.
What is ascending order 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.
How do I rearrange tables in MySQL?
You can SELECT INTO a new table from the old table, ordering your select into as desired. Have an auto-increment ID in the new table. If needed, drop the old table and rename the new table.
Can we use ORDER BY in insert query?
The only thing that order by on an insert is guaranteed to do is assign the values of an identity column if one exists. Your select has no order by, hence SQL is in no way required to return the data in any particular order.