Difference between order by and group by in SQL, sqlorder

Difference between order by and group by in SQL, sqlorder

In English, order by is the sort of rows. The default value is ascending. Order by must be followed by multiple field names.

Group by is a group in English. You must have an aggregate function. At least one group flag field is required for use.

What is an aggregate function "?

For example, sum (), count (), and avg () are all "Aggregate functions"

The purpose of using group by is to classify and summarize data.

Generally, for example:

Select organization name, count (employee id), sum (employee salary) form [A Table]

Group by unit name

The result is that the number of employees and total wages of each unit are counted based on the "unit name.

In the order in which the SQL command format is used, group by is prior to order.

The standard format of the select command is as follows:

SELECT select_list [INTO new_table] FROM table_source [WHERE search_condition] [group by group_by_expression] [HAVING search_condition]

The preceding section describes the differences between order by and group by in SQL statements. I hope it will be helpful to you. If you have any questions, please leave a message, the editor will reply to you in time!