SaaS- Tenant Specific Lookup Data in Shared Database

Question

I am developing multitenant SaaS based application and going with Shared Database for storing all the tenant records with help of TenantId column.

Now the problem is i h

Answer 1

We have a saas based database and we keep common data and tenant data in the same table.

Concept

GamesTable

    Id NOT NULL
    TenantId NULL
    GameName NOT NULL
    Add a unique key for TenantId and GameName

• if TenantId is NULL you know it is common data
• if TenantId is NOT NULL you know it belongs to a specific tenant and who exactly.

"Is there any other DB design which allows me to do mix both common master data and tenant master data with JOIN?"

Yes

SELECT *
  FROM GamesTable where TenantId = 'your tenant id'
  UNION
SELECT *
  FROM GamesTable where TenantId IS NULL  -- common