Master SQL View

I am wanting to create a view using postgresql that essentially shows me all information in the entire database.

Example:

Table 1

• pin
• insert_time

Table 2

• tmr
• insert_time

Table 3

• weight
• insert_time

Desired Output View

• pin
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• tmr
• weight
• insert_time

The output view would be sorted by insert_time. It would just leave the columns blank that aren't used for that row ie. If it pulled from Table 1 then PIN and insert_time would be filled but tmr and weight would be left blank.

How can I go about doing this? I can create other tables if needed, but not sure how I would do this.

CREATE VIEW everything
AS
SELECT insert_time, pin, null as tmr, null as weight
FROM table_1
UNION ALL
SELECT insert_time, null as pin, tmr, null as weight
FROM table_2
UNION ALL
SELECT insert_time, pin, tmr, weight
FROM table_3;