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PHP/Mysql -Kasi idea sikit camna nak buat ni
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Aku dah google sejak semalam, dah test macam macam tapi tak menjadi..
Harap sesiapa boleh bagi idea:
Table 1:
system_id
system_vendor
system_name
Table 2:
user_id
user_name
user_department
Table 3:
memory_id
memory_slot
memory_capacity
Table kat atas ni contoh aja. Data contoh seperti berikut:
Table 1
system_id
| system_vendor
| system_model | X1245 | Dell | Optiplex 790 | X1222 | Dell
| Optiplex 7010 | X4444
| HP | Proliant |
Table 2
user_id | user_name | user_department | X1245 | Sadiq_segaraga | IT | X1222 | Abdul Wahub
| Muzik | X4444 | Abdul Wahid
| Burung |
Table 3
memory_id | memory_slot
| memory_capacity
| X1245 | 1 | 1024 | X1245 | 2 | 1024 | X1222 | 1 | 1024 | X4444 | 1 | 512 | X4444 | 2 | 512 | X4444 | 3 | 512 | X4444 | 4 | 512 |
Untuk query table 1 dan 2 join tak de masalah. Masalah nak join query table 3 sekali tu..
Contoh: aku nak query user yang pakai jenis dan model computer yang ram dia 2048. Camna command dia?
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cube pakai query nih :
select table2.*, table3.memory_slot, table3.memory_capacity , table1.system_vendor, table1.system_model
from table2
left outer join table3 on table2.user_id = table3.memory_id
left outer join table1 on table2.user_id = table1.system_id
result :
dari sql statement tu bleh la letak condition ape yg ko nak
"where memory_capacity = 2048"
btw, aku test sql ni kat dalam access ... sorry aku takde mysql.. but aku rase sql statement wise, more or less lebey kurang jer... yg penting ko kene join table pakai outer join ... Last edited by azradiza on 20-5-2013 03:29 PM
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azradiza posted on 20-5-2013 03:26 PM
cube pakai query nih :
select table2.*, table3.memory_slot, table3.memory_capacity , table1.syste ...
Terima kasih daun kelapa sawit..
Tapi kat mana yang nak bubuh SUM(memory.memory_capacity) tu? sebab sepatunya query tu resultnya camn
User | Department | Vendor | Model | memory | | Sadiq_seagraga | IT | Dell | Optiplex 790
| 2048 | | Abdul Whid
| Burung | HP | Proliant | 2048 | |
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select table2.user_name,table2.user_department, table1.system_vendor, table1.system_model, sum ( table3.memory_capacity) as memory
from table2
left outer join table3 on table2.user_id = table3.memory_id
left outer join table1 on table2.user_id = table1.system_id
group by
table2.user_name,table2.user_department, table1.system_vendor, table1.system_model
*edit sket.. tadik missing 1 column Last edited by azradiza on 20-5-2013 04:28 PM
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yang WHERE memory='2048' nak letak mana?
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kena tanya dewa @kambinggila
tak suka database ni, sama hazab bahasa dia dengan regex |
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ko try tambah kat and statement ko macam nih..
and b.user_id in (select memory_id from table3
group by memory_id
having sum(memory_capacity) = '2048')
aku belasah je ni. tak tengok pon betul betul hahahaha |
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kau tak kan boleh buat sebab:
1. table 1 tak de relation dgn table 2. mcm mana nak tau user apa pakai pc mana?
2. table 1 MUNGKIN tak der relation dengan table 3, unless `Table 1`.system_id merujuk kepada `Table 3`.memory_id. sekali baca macam tak, sebab sistem id refer ke komputer, memory id refer ke RAM, tapi bila tengok rekod match la pulak value dia. kalau table 1 tak der relation dgn table 3, mcm mana nak tau PC apa pakai RAM mana?
bila dah ada relation, lepas join2, dia punya condition ialah `Table 3`.memory_slot * `Table 3`.memory_capacity = 2048
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