Select Max (date) between multiple tables

I need to retrieve a record from a Table in a set of similar tables with a common "date field". You can select the record where this "date field" value is greater between multiple tables.

Here, any help is appreciated.  Thank you in advance.

FOR EXAMPLE

No. EMP is the primary key.

Again, each table can have multiple records for EMP n ° 1

TABLE1:

FIRST NAME

FAMILY NAME
THE EMP NO.

BASE SALARY

DATE_FROM

TABLE 2

FIRST NAME

FAMILY NAME
THE EMP NO.

SALARY GRADE

DATE_FROM

TABLE 3

FIRST NAME

FAMILY NAME
THE EMP NO.

COMPENSATION

DATE_FROM

Hello

Said Knani, if you use the current design of the table, then here is a way to do what you want:

WITH union_data AS

(

SELECT MAX (base_salary) AS sal FROM table1 UNION ALL

SELECT MAX (grade_salary) table2 UNION ALL

SELECT MAX (compensation) FROM table3

)

SELECT MAX (sal) AS max_sal

Of union_data

;

Tags: Database

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