Kufungua Taarifa ya SQL - Nyoka ya INNER JOIN
- Kigeukia wa Kwanza Kigeukia wa Kupya
- Pya Kigeukia wa Kimaadili wa SQL
Kufungua Taarifa ya SQL - Nyoka ya INNER JOIN
Kama ingia hizi siku ingia, INNER JOIN kibonyeza kuweka mita.
Mafano ya kichwa cha INNER JOIN
SELECT column_name(s) FROM table_name1 INNER JOIN table_name2 ON table_name1.column_name=table_name2.column_name
Mafano:INNER JOIN na JOIN ni hasa hiyo.
Tabia ya kwanza (inatumiwa kwenye mifano):
Jiografia ya 'Persons' tabia:
| Id_P | LastName | FirstName | Jiografia | City |
|---|---|---|---|---|
| 1 | Adams | John | Oxford Street | London |
| 2 | Bush | George | Fifth Avenue | New York |
| 3 | Carter | Thomas | Changan Street | Beijing |
Jiografia ya 'Orders' tabia:
| Id_O | OrderNo | Id_P |
|---|---|---|
| 1 | 77895 | 3 |
| 2 | 44678 | 3 |
| 3 | 22456 | 1 |
| 4 | 24562 | 1 |
| 5 | 34764 | 65 |
Mfano wa kigeukia wa kimaadili (INNER JOIN)
Sasa, tunatua kuonyesha matokeo wa wote wa mnamo.
Unaweza kutumia maandiko ya SELECT hii:
SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.Id_P=Orders.Id_P ORDER BY Persons.LastName
Matokeo:
| LastName | FirstName | OrderNo |
|---|---|---|
| Adams | John | 22456 |
| Adams | John | 24562 |
| Carter | Thomas | 77895 |
| Carter | Thomas | 44678 |
Kichwa cha INNER JOIN kinatuma upate upande wa muafaka wote ambao kuna uharibifu kwenye tabia. Ikiwa upande wa 'Persons' haukuna upoteaji kwenye 'Orders', upande huo haukufichwa.
- Kigeukia wa Kwanza Kigeukia wa Kupya
- Pya Kigeukia wa Kimaadili wa SQL
