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When to use order by in MySQL?
MySQL Order By. MySQL Order By clause is used to sort the table data in either Ascending order or Descending order. By default data will not be inserted into Tables in any order unless you have an index. So, If you want to retrieve the data in any particular order, you have to sort it by using MySQL Order By statement.
Why do you use order by null in MySQL?
It’s for performance; adding ORDER BY NULL after a GROUP BY clause will make your query faster. An explanation, from the manual: By default, MySQL sorts all GROUP BY col1, col2, queries as if you specified ORDER BY col1, col2, in the query as well.
What does DESC stand for in MySQL ORDER BY clause?
In this syntax, you specify the one or more columns which you want to sort after the ORDER BY clause. The ASC stands for ascending and the DESC stands for descending. You use ASC to sort the result set in ascending order and DESC to sort the result set in descending order. This ORDER BY clause sorts the result set in ascending order:
How to sort customers by last name in MySQL?
The following query uses the ORDER BY clause to sort the customers by the values in the contactLastName column in ascending order. If you want to sort customers by the last name in the descending order, you use the DESC after the contactLastname column in the ORDER BY clause as shown in the following query:
How to sort column by column in MySQL?
If you want to sort the result set by multiple columns, you specify a comma-separated list of columns in the ORDER BY clause: It is possible to sort the result by a column in ascending order, and then by another column in descending order: First, sort the result set by the values in the column1 in ascending order.
When to use the ORDER BY clause in SQL?
The SQL ORDER BY clause is used to sort the data in ascending or descending order, based on one or more columns.