Multiple Select statements in one Query in SQLite

Question

Is it possible to run multiple select statements in one query in SQLite?

Such as:

SELECT ( 
           SELECT ChestGemEffects.Value,
                  Effect.Name
             FROM ChestGemEffects
                  INNER JOIN Effect
                          ON ChestGemEffects.EffectId = Effect.Id
                  INNER JOIN Gems
                          ON ChestGemEffects.GemId = Gems.Id
            WHERE ( Gems.[Key] = 'SG1' )  
       ) 
       AS ChestEffects,
       ( 
           SELECT WeaponGemEffects.Value,
                  Effect.Name
             FROM WeaponGemEffects
                  INNER JOIN Effect
                          ON WeaponGemEffects.EffectId = Effect.Id
                  INNER JOIN Gems
                          ON WeaponGemEffects.GemId = Gems.Id
            WHERE ( Gems.[Key] = 'SG1' )  
       ) 
       AS WeaponEffects,
       ( 
           SELECT OthersGemEffects.Value,
                  Effect.Name
             FROM OthersGemEffects
                  INNER JOIN Effect
                          ON OthersGemEffects.EffectId = Effect.Id
                  INNER JOIN Gems
                          ON OthersGemEffects.GemId = Gems.Id
            WHERE ( Gems.[Key] = 'SG1' )  
       ) 
       AS OthersEffects;

It gives me the error:

'Error while executing query: only a single result allowed for a SELECT that is part of an expression'

Is there something wrong with my expression or is this just not supported in SQLite?

Thanks

Answer 1

Using the result of a subquery as a source table for further querying must be done in the FROM clause:

SELECT * FROM (SELECT ...), (SELECT ...)

However, this would be a cross join, which is not what you want.

To just append multiple tables (with the same number of columns), use UNION ALL:

SELECT ChestGemEffects.Value,
       Effect.Name
  FROM ...
  ...
UNION ALL
SELECT WeaponGemEffects.Value,
       Effect.Name
  FROM ...
  ...