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For this reason, cross joins have huge implications for the performance of your database server Fortunately, there are only a few cases where a cross join is necessary one example would be to generate test data, another to create a derived table that can be used for further joins and in all those cases, it s a good idea to attach a WHERE clause to the join to limit the size of the result set generated and to clearly specify which fields should be returned in the result set
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Inner Joins
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Inner joins are the most common type of join and also the most symmetrical, because they require a match in each table that forms a part of the join Rows that do not match are excluded from the final result set The most common example of an inner join is the equi-join, where certain fields in the joined tables are equated to each other using the equality (=) operator In this case, the final result set only includes those rows from the joined tables that have matches in the specified fields
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NoTe The joins shown in the previous section, A Simple Join, are equi-joins
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To illustrate an equi-join, consider the following query, which displays the registration number and type of each of the airline s aircraft, by joining the aircraft and aircrafttype tables on the common AircraftTypeID field:
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mysql> SELECT aRegNum, atAircraftName -> FROM aircraft AS a, aircrafttype AS at -> WHERE aAircraftTypeID = atAircraftTypeID; +--------+--------------+ | RegNum | AircraftName | +--------+--------------+ | ZX6488 | Boeing 747 | | ZX5373 | Boeing 747 | | ZX5731 | Boeing 747 | | ZX5830 | Boeing 747 | | ZX6821 | Boeing 767 | | ZX7283 | Airbus A330 | | ZX5382 | Airbus A330 | | ZX5921 | Airbus A330 | | ZX582 | Airbus A330 | | ZX5173 | Airbus A330 | | ZX7391 | Airbus A330 | | ZX5464 | Airbus A340 | | ZX1386 | Airbus A340 | | ZX7634 | Airbus A340 | | ZX7472 | Airbus A340 | | ZX1037 | Airbus A380 | +--------+--------------+ 16 rows in set (001 sec)
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Here s another example, this one listing routes greater than 5000 kilometers and the flights that operate on them:
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PARTIII PART PART
mysql> SELECT rRouteID, fFlightID, rDistance -> FROM route AS r, flight AS f -> WHERE rRouteID = fRouteID -> AND rDistance > 5000; +---------+----------+----------+ | RouteID | FlightID | Distance | +---------+----------+----------+ | 1003 | 345 | 7200 | | 1133 | 765 | 6336 | | 1180 | 685 | 10863 | | 1193 | 724 | 10310 | | 1192 | 725 | 10310 | +---------+----------+----------+ 5 rows in set (000 sec)
Although uncommon, inner joins based on inequalities between fields are also possible However, these types of joins cannot be called equi-joins, as they do not make use of the equality operator Here s an example:
mysql> SELECT aRegNum, atAircraftName -> FROM aircraft AS a, aircrafttype AS at -> WHERE aAircraftTypeID != atAircraftTypeID; +--------+-----------------+ | RegNum | AircraftName | +--------+-----------------+ | ZX6488 | Boeing 767 | | ZX6488 | Airbus A300/310 | | ZX6488 | Airbus A330 | | ZX6488 | Airbus A340 | | ZX6488 | Airbus A380 | | ZX5373 | Boeing 767 | | ZX5373 | Airbus A300/310 | | ZX5373 | Airbus A330 | | ZX5373 | Airbus A340 | | ZX6488 | Airbus A300/310 | +--------+-----------------+ 80 rows in set (001 sec)
Part I:
Usage
NoTe For compliance with the SQL standard, MySQL also supports the use of the INNER
JOIN and CROSS JOIN keywords instead of the comma (,) used in those operations For example, the following two statements both produce a cross join:
SELECT CountryName, StateName FROM country, state; SELECT CountryName, StateName FROM country CROSS JOIN state;
just as the following two statements both create an inner equi-join:
SELECT cCountryName, sStateName FROM country AS c, state AS s WHERE sCountryID = cCountryID; SELECT cCountryName, sStateName FROM country AS c INNER JOIN state AS s WHERE sCountryID = cCountryID;
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