Access 2010: Erro de sintaxe (operador ausente) na expressão de consulta
Eu quero ter três tabelas na minha consulta SQL, mas recebo uma mensagem de erro.
Eu tenho este código sql:
SELECT warehouse.expiry_date, pharmacy.expiry_date, drugs.active_substance,
drugs.strength, drugs.strength_type, drugs.dosage_form, drugs.minimum_quantity,
SUM(warehouse.in_quant)+SUM(pharmacy.in_quant)-SUM(warehouse.out_quant)-
SUM(pharmacy.out_quant) AS Total_available_stock
FROM drugs as a
INNER JOIN warehouse as b
ON a.ID = b.drug_id
INNER JOIN pharmacy as c
ON b.drug_id = c.drug_id
GROUP BY warehouse.expiry_date, pharmacy.expiry_date, drugs.active_substance,
drugs.strength, drugs.strength_type, drugs.dosage_form, drugs.minimum_quantity;
E eu recebo o erro:
Syntax error (missing operator) in query expression in 'a.ID = b.drug_id
INNER JOIN pharmacy as c
on b.drug_id = c.drug_i'.
Alguma ajuda por favor?