MySQL - query to show guests with same last_name + booking

MySQL - query to show guests with same last_name + booking_date [closed]

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I have a guest table and a booking table and I am attempting to query how to find guests who share the same last names with the same booking date.

The result should output their last_name and first_names without any duplicate results.

SELECT g1.first_name, 
 g2.first_name,
 g1.last_name, 
 b.booking_date
FROM guest g1, guest g2 JOIN booking b ON id=booking_id
WHERE g1.last_name = g2.last_name AND g1.id<>g2.id AND b.booking_date=b.booking_date;

When I run this, I get back the empty set.

Where am I going wrong?

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

closed as off-topic by Christopher, ctrl-alt-delor, mosvy, RalfFriedl, thrig Nov 20 at 18:48

This question does not appear to be about Unix or Linux within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

it has been a while, and I have not done much sql, but do you need two joins.
– ctrl-alt-delor
Nov 20 at 14:18

@ctrl-alt-delor perhaps, join g1 to b1 and g2 to b2?
– qoph
Nov 20 at 14:26

3

I'm voting to close this question, because it would be better served on dba.stackexchange.com
– ctrl-alt-delor
Nov 20 at 14:33

thanks, wrong exchange
– qoph
Nov 20 at 14:36

add a comment |

up vote
1
down vote

favorite

I have a guest table and a booking table and I am attempting to query how to find guests who share the same last names with the same booking date.

The result should output their last_name and first_names without any duplicate results.

SELECT g1.first_name, 
 g2.first_name,
 g1.last_name, 
 b.booking_date
FROM guest g1, guest g2 JOIN booking b ON id=booking_id
WHERE g1.last_name = g2.last_name AND g1.id<>g2.id AND b.booking_date=b.booking_date;

When I run this, I get back the empty set.

Where am I going wrong?

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

closed as off-topic by Christopher, ctrl-alt-delor, mosvy, RalfFriedl, thrig Nov 20 at 18:48

This question does not appear to be about Unix or Linux within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

it has been a while, and I have not done much sql, but do you need two joins.
– ctrl-alt-delor
Nov 20 at 14:18

@ctrl-alt-delor perhaps, join g1 to b1 and g2 to b2?
– qoph
Nov 20 at 14:26

3

I'm voting to close this question, because it would be better served on dba.stackexchange.com
– ctrl-alt-delor
Nov 20 at 14:33

thanks, wrong exchange
– qoph
Nov 20 at 14:36

add a comment |

up vote
1
down vote

favorite

I have a guest table and a booking table and I am attempting to query how to find guests who share the same last names with the same booking date.

The result should output their last_name and first_names without any duplicate results.

SELECT g1.first_name, 
 g2.first_name,
 g1.last_name, 
 b.booking_date
FROM guest g1, guest g2 JOIN booking b ON id=booking_id
WHERE g1.last_name = g2.last_name AND g1.id<>g2.id AND b.booking_date=b.booking_date;

When I run this, I get back the empty set.

Where am I going wrong?

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

I have a guest table and a booking table and I am attempting to query how to find guests who share the same last names with the same booking date.

The result should output their last_name and first_names without any duplicate results.

SELECT g1.first_name, 
 g2.first_name,
 g1.last_name, 
 b.booking_date
FROM guest g1, guest g2 JOIN booking b ON id=booking_id
WHERE g1.last_name = g2.last_name AND g1.id<>g2.id AND b.booking_date=b.booking_date;

When I run this, I get back the empty set.

Where am I going wrong?

mysql sql mariadb

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

edited Nov 20 at 14:29

ctrl-alt-delor

10.2k41955

asked Nov 20 at 13:48

qoph

135

asked Nov 20 at 13:48

qoph

135

asked Nov 20 at 13:48

qoph

135

closed as off-topic by Christopher, ctrl-alt-delor, mosvy, RalfFriedl, thrig Nov 20 at 18:48

This question does not appear to be about Unix or Linux within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

closed as off-topic by Christopher, ctrl-alt-delor, mosvy, RalfFriedl, thrig Nov 20 at 18:48

This question does not appear to be about Unix or Linux within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

it has been a while, and I have not done much sql, but do you need two joins.
– ctrl-alt-delor
Nov 20 at 14:18

@ctrl-alt-delor perhaps, join g1 to b1 and g2 to b2?
– qoph
Nov 20 at 14:26

3

I'm voting to close this question, because it would be better served on dba.stackexchange.com
– ctrl-alt-delor
Nov 20 at 14:33

thanks, wrong exchange
– qoph
Nov 20 at 14:36

add a comment |

it has been a while, and I have not done much sql, but do you need two joins.
– ctrl-alt-delor
Nov 20 at 14:18

@ctrl-alt-delor perhaps, join g1 to b1 and g2 to b2?
– qoph
Nov 20 at 14:26

3

I'm voting to close this question, because it would be better served on dba.stackexchange.com
– ctrl-alt-delor
Nov 20 at 14:33

thanks, wrong exchange
– qoph
Nov 20 at 14:36

it has been a while, and I have not done much sql, but do you need two joins.
– ctrl-alt-delor
Nov 20 at 14:18

@ctrl-alt-delor perhaps, join g1 to b1 and g2 to b2?
– qoph
Nov 20 at 14:26

I'm voting to close this question, because it would be better served on dba.stackexchange.com
– ctrl-alt-delor
Nov 20 at 14:33

thanks, wrong exchange
– qoph
Nov 20 at 14:36

add a comment |

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