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MySQL - the execution order of an SQL statement
2022-06-12 19:50:00 【WD Technology】
sql sentence :
SELECT DISTINCT <select_list>
FROM <left_table>
<join_type> JOIN <right_table>
ON <join_condition>
WHERE <where_condition>
GROUP BY <group_by_list>
HAVING <having_condition>
ORDER BY <order_by_condition>
LIMIT <limit_number>
Machine reading :
FROM <left_table>
ON <join_condition>
<join_type> JOIN <right_table>
WHERE <where_condition>
GROUP BY <group_by_list>
HAVING <having_condition>
SELECT DISTINCT <select_list>
ORDER BY <order_by_condition>
LIMIT <limit_number>
The order :
from: Which data table to retrieve data from
where: Conditions for filtering data in a table
group by: How to group the data filtered above
having: The conditions for filtering the grouped data above
select: See which column in the result set , Or column
order by : In what order to view the returned data
Add :
https://www.cnblogs.com/cdf-opensource-007/p/6502556.html
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