What is gained when writing:
SELECT m.`iD` FROM `MyTable` AS m
instead of:
SELECT `MyTable`.`iD` FROM `MyTable`
What is gained when writing: SELECT m.`iD` FROM `MyTable` AS m instead of: SELECT
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What is gained when writing:
SELECT m.`iD` FROM `MyTable` AS m
instead of:
SELECT `MyTable`.`iD` FROM `MyTable`
The main purpose would be to change the name of a column to the “AS” name for subsequent result set processing. Suppose you have a function that reads a result set and expects a column named “FOO”, but your table has the column named “BAR”.
If you write:
The result set will have a column named “bar”. If you write:
Then, the result set will have a “foo” column. It allows you to alias a column name.