How to join multiple table with case conditional

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I have table name "order_booking". It has one field name is 'type' and value of type like 'commercial,packaging,order'.

I have another three table 'commercial_estimation','packaging_estimation' and 'order_estimation'.

My question is that i want to join 'order_booking' table with this three table but conditional means if i have a type 'commercial' then join with 'commercial_estimation' table,if i have type 'packaging' then join with 'packaging_estimation' table and if i have type 'Order' then join with 'order_estimation' table. So, i can only join with any one table based on 'type'.

What I have tried:

SELECT a.type FROM  order_booking a 
    (Case when type a.type = 'commercial' Then 'Inner Join commercial_estimation  b on a.id = b.oid' 
          when type a.type = 'packaging' Then 'Inner Join packaging_estimation  b on a.id = b.oid' 
          else  type a.type = 'order' Then 'Inner Join order_estimation  b on a.id = b.oid' END)

Posted 18-Apr-18 3:25am

Sabhani Vipul

Updated 18-Apr-18 4:03am

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User 11060979 · Answer 1 · 2018-04-18T04:04:00

How is about this:

SQL

SELECT 
  a.type,
   
FROM  order_booking a
LEFT JOIN commercial_estimation b ON a.type = 'commercial' AND b.oid = a.id
LEFT JOIN packaging_estimation c ON a.type = 'packaging' AND c.oid = a.id
LEFT JOIN order_estimation d ON a.type = 'order' AND d.oid = a.id

To have access to the Details you can also use COALESCE in case the datatype do match and you like to have one field for the three Details.