Priority of AND and OR operator in Mysql select query [closed]

问题

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.

Closed 6 years ago.

I have a written a mysql select query to fetch schedule details based on origin states,origin city,destination state and destination city. In my query i have used AND and OR operator.

Here is my query,

SELECT * FROM TruckLoadSchedule ts 
WHERE ts.originState IN (states) AND ts.originCity IN (cities) 
   OR ts.destState IN (states) AND ts.destCity IN (cities);

But I need to know the priority of AND and OR operator in the above query, i mean to say will it do something like this (X AND Y) OR (M AND Q) internally?

回答1:

Yes, AND has higher precedence than OR. x and y are bound together, m and q are bound together, then the resulting expressions are ORed.

回答2:

AND has a higher priority than OR in every programming language I have ever seen, and I've seen several dozen at close quarters, and implemented a few myself. This question was basically settled in 1960 with the Algol-60 report, if not already in Fortran (1957).

[There was one exception but it was a mis-implemented language with no operator precedence at all. I fixed that.]

回答3:

Yes it will do something like (X AND Y) OR (M AND Q). AND operator's priority is higher than OR.

For more see MySQL: Operator Precedence

来源：https://stackoverflow.com/questions/16249865/priority-of-and-and-or-operator-in-mysql-select-query