unir 3 tablas en el ejemplo de código sql

Luego de investigar en diversos repositorios y sitios webs al terminar encontramos la solución que te enseñamos a continuación.

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 múltiples 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: sql une 3 tablas

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

Ejemplo 5: 3 uniones 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 ;

Finalizando este artículo puedes encontrar las referencias de otros usuarios, tú además tienes la opción de mostrar el tuyo si lo deseas.

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