database - Simple inventory SQL query not listing all products MS-ACCESS -


so have simple select query: design view of query

select tblproducts.product_id, sum(tblintakes.intake_qty)-sum(tblexits.exit_qty) stock (tblproducts inner join tblexits on tblproducts.product_id = tblexits.product_id)    inner join tblintakes on tblproducts.product_id = tblintakes.product_id group tblproducts.product_id;

it doesn't list products. list products had intake , exit. isn't useful since know stock level of products.

this query:

| product_id | stock | | 1          | 4     |

this wan't get

| product_id | stock | | 1          | 4     | | 2          | 10    | | 3          | 0     |

this shouldn't complicated i'm new access , sql , it's giving me headache. appreciated

these records:

products

| product_id | product_name | | 1          | pencil       | | 2          | book         | | 3          | marker       |

intakes

| intake_id | intake_date | product_id  | intake_qty | | 1         | 20/07/2017  | 1           | 10         | | 2         | 20/07/2017  | 2           | 10         |

exits

| exit_id | exit_date  | product_id | exit_qty | | 1       | 21/07/2017 | 1          | 6        |

you looking left join , nz()

select tblproducts.product_id,        nz(sum(tblintakes.intake_qty), 0) - nz(sum(tblexits.exit_qty)) stock (tblproducts left join       tblexits       on tblproducts.product_id = tblexits.product_id      ) left join       tblintakes       on tblproducts.product_id = tblintakes.product_id group tblproducts.product_id;

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