MySQL query between dates - mysql

Question

I have the following table, where bookings can be made
CREATE TABLE booking (
bookingID INT UNSIGNED NOT NULL AUTO_INCREMENT,
customerID INT,
runID INT,
startDate DATETIME,
endDate DATETIME,
dateBookedOn TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (bookingID),
INDEX idx_start (startDate),
INDEX idx_end (endDate),
FOREIGN KEY (runID) REFERENCES RUn(RunID),
FOREIGN KEY (customerID) REFERENCES customer(CustomerID)
)
Then i have a run table
CREATE TABLE run
(
RunID INT UNSIGNED NOT NULL AUTO_INCREMENT,
RunName VARCHAR(15),
PricePerNight DECIMAL(3,2),
primary key (RunID)
);
I am querying the run table to get all runID's that do not lie between two dates in the booking table, as follows.
SELECT *
FROM run
WHERE Runid NOT IN (SELECT RunID
FROM booking
WHERE CAST(startDate AS DATE) >= '2015-07-19' AND
CAST(endDate AS DATE) <= '2015-07-25');
How would I change the query to select runID's that don't have ANY dates between them, if the dates overlap with query dates they are included in result set.
ie if a new booking had a startDate 2015-07-15 and a endDate 2015-07-21 then it will still show in the queries result set.

Answer 1

Your query does what you want, but might be a bit slow: Avoid NOT IN if you can. This should do the same but is just faster:
SELECT a.*
FROM run a
LEFT JOIN booking b ON a.runID=b.runID
AND startDate>= '2015-07-19' AND endDate<= '2015-07-25'
WHERE b.runID IS NULL;
Also avoid casting your data from your database: If you want/have to cast anything, cast your variables: Casting your variable=1 value cast, casting the data from your database is N values cast, plus that indexes can not be used anymore.