sql order of operations
//this_for_descending_order..
SELECT * FROM TableName ORDER BY columnName DESC;
// this_for_ascending_order..
SELECT * FROM TableName ORDER BY columnName ASC;
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SQL order of execution defines the
execution order of clauses.
-Select
It starts execution with
-from (Choose and join tables to get base data)
after from
-where ( filters base data )
-group by (Aggregates base data)
-having (filters aggregated data)
-select (returns final data)
-order by (sorts the final data)
-limit (limits the returned data to a row count)
Only select and from are mandatory
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SELECT DISTINCT column, AGG_FUNC(column_or_expression), …
FROM mytable
JOIN another_table
ON mytable.column = another_table.column
WHERE constraint_expression
GROUP BY column
HAVING constraint_expression
ORDER BY column ASC/DESC
LIMIT count OFFSET COUNT;
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ORDER BY: is for sorting result
either in descending or ascending order.
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Used to sort the result data in ascending (default) or descending order
through the use of ASC or DESC keywords.
Example: Returns countries in alphabetical order.
SELECT * FROM countries
ORDER BY name;
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