Sql pripojiť 3 tabuľky
Príklady kódu
sql ľavý pripojiť viac tabuliek s podmienkami
-- LEFT OUTER JOIN is equivalent to LEFT JOIN
-- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3)
SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a
LEFT OUTER JOIN table2 b ON a.ID = b.ID
LEFT OUTER JOIN table3 c ON a.ID = c.ID
WHERE a.ID >= 1000;
-- ⇓ Test it ⇓ (Fiddle source link)sql pripojiť 3 tabuľky
-- Rows with ID existing in both a, b and c
-- JOIN is equivalent to INNER JOIN
SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a
JOIN table2 b ON a.ID = b.ID
JOIN table3 c ON a.ID = c.ID
WHERE a.ID >= 1000;
-- ⇓ Test it ⇓ (Fiddle source link)pripojiť tri tabuľky sql
Suppose we are having three table named as
Student_details
Attendance_details
Batch_details
And we have to apply join these three tables for fetching records
Example query:
select column_names
from Student_detail as s join Attendance_details as a on
s.s_id = a.s_id join Batch_details as b on
s.s_id = b.s_id;
Here in the above example we implemented simple join but you change it with own join requirements.sql pripojiť 3 tabuľky
SELECT column-names
FROM table-name1 JOIN table-name2
ON column-name1 = column-name2
WHERE condition3 sa pripojí v sql
SELECT e.FIRST_NAME , -- coming from EMPLOYEES table
d.DEPARTMENT_NAME ,-- coming from DEPARTMENTS table
l.CITY , -- coming from LOCATIONS table
c.COUNTRY_NAME , -- coming from COUNTRIES table
r.REGION_NAME -- coming from REGIONS table
FROM EMPLOYEES e
INNER JOIN DEPARTMENTS d on e.DEPARTMENT_ID = d.DEPARTMENT_ID
INNER JOIN LOCATIONS l on l.LOCATION_ID = d.LOCATION_ID
INNER JOIN COUNTRIES c on l.COUNTRY_ID = c.COUNTRY_ID
INNER JOIN REGIONS r on c.REGION_ID = r.REGION_ID ;Podobné stránky
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