cómo unir 3 tablas en el ejemplo de código sql

Al fin luego de tanto trabajar ya encontramos la contestación de este atascamiento que algunos de nuestros usuarios de este sitio presentan. Si deseas compartir algo no dudes en compartir tu conocimiento.

Ejemplo 1: cómo unir tablas en sql

JOINING 2TablesinsqlSELECT X.Column_Name , Y.Column_Name2
FROM TABLES1_NAME X 
INNERJOIN TABLES2_NAME Y ON X.Primary_key = Y.Foreign_key;--FOR EXAMPLE--GET THE FIRST_NAME AND JOB_TITLE--USE EMPLOYEES AND JOBS TABLE--THE RELATIONSHIP IS JOB_IDSELECT E.FIRST_NAME , J.JOB_TITLE
FROM EMPLOYEES E
INNERJOIN JOBS J ON J.JOB_ID = E.JOB_ID;

Ejemplo 2: unir varias tablas sql

SELECT TableA.*, TableB.*, TableC.*, TableD.*FROM TableA
    JOIN TableB
        ON TableB.aID = TableA.aID
    JOIN TableC
        ON TableC.cID = TableB.cID
    JOIN TableD
        ON TableD.dID = TableA.dID
WHEREDATE(TableC.date)=date(now())

Ejemplo 3: unir tres tablas sql

Suppose we are having three table named as 
Student_details
Attendance_details
Batch_details
And we have toapplyjoin these three tablesfor 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 simplejoin but you change it with own join requirements.

Ejemplo 4: unir varias tablas en sql

SELECT Books_Namn, Author_Namn, Author_Age, Store_Namn FROM books

JOIN Author ON Author_Id = Author_Author_Id

JOIN Books_has_Store ON Books_Books_Id = Books_Id

JOIN Store ON Store_Id = Store_Store_Id;

Ejemplo 5: sql une 3 tablas

SELECTcolumn-names
  FROMtable-name1 JOINtable-name2 
    ONcolumn-name1 =column-name2
 WHERE condition

Ejemplo 6: 3 combinaciones en 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 tableFROM EMPLOYEES e 
	INNERJOIN DEPARTMENTS d on e.DEPARTMENT_ID = d.DEPARTMENT_ID
	INNERJOIN LOCATIONS l   on l.LOCATION_ID   = d.LOCATION_ID
	INNERJOIN COUNTRIES c   on l.COUNTRY_ID    = c.COUNTRY_ID
	INNERJOIN REGIONS r     on c.REGION_ID     = r.REGION_ID ;

Eres capaz de añadir valor a nuestro contenido informacional añadiendo tu veteranía en las explicaciones.

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