php - mysql multiple row values in where condition on a single table -


this question exact duplicate of:

i had unique requirement. don't know it's table structure problem or thing else, need solution output either structure change or query change.

i had table containing dynamic values of 2 fields of single user. single user can have multiple records of types.

example tables below

table name: tbl_parameters

parameter_id         parameter_name 1                    current location 2                    booked location 3                    room type

table name: tbl_paramter_data 

id(auto_increment)    user_id   parameter_id       parameter_value  1                        10     1                  hyderabad 2                        10     2                  delhi 3                        10     3                  deluxe room 4                        11     1                  hyderabad 5                        11     2                  bombay 6                        11     3                  a/c room 7                        12     1                  delhi 8                        12     2                  bombay 9                        12     3                  deluxe room 10                       13     1                  hyderabad 11                       13     2                  delhi 12                       13     3                  single room

the above 2 tables. hotel booking table. user can book hotel room india. so, stored in 2 different table. 1st table contain type of parameters need store parameter_id. 2nd table contain parameters values of each user booked, room booked , remaining data. there other parameters also. **the no of parameters dynamic. there not fixed no of parameters, that's reason maintained separate table tbl_parameters.

my question how can data of

  1. who users booked rooms "hyderabad" in "bombay" hotel?
  2. who users booked "deluxe rooms" "delhi" in "bombay" hotel?

how write query fetch above data existing table(tbl_parameter_data)?

or shall need change table structure or way storing?

i think trick. (not tested yet) depends on how complex query (each paramater needs new joins)

select user_id tbl_parameter_data p1 join       tbl_parameters pa1 on p1.parameter_id = pa1.parameter_id join (tbl_parameter_data p2 join       tbl_parameters pa2 on p2.parameter_id = pa2.parameter_id)  on p1.user_id=p2.user_id pa1.parameter_name = "current location"    , p1.parameter_value = "hydrabad"    , pa2.parameter_name = "booked location"    , p2.parameter_value = "bombay"

old version:

select user_id tbl_parameter_data p1 join  join tbl_parameter_data p2 on p1.user_id=p2.user_id p1.parameter_id = 1     , p1.parameter_value = "hydrabad"     , p2.parameter_id = 2     , p2.parameter_value = "bombay"

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