When to Open and Close Brackets Surrounding Joins in Ms Access SQL

[] brackets in sql statements

The [] marks the delimitation of a identifier, so if you have a column whose name contains spaces like Order Qty you need to enclose it with [] like:

select [Order qty] from [Client sales]

They are also to escape reserved keywords used as identifiers

What is the use of the square brackets [] in sql statements?

The brackets are required if you use keywords or special chars in the column names or identifiers. You could name a column [First Name] (with a space) – but then you'd need to use brackets every time you referred to that column.

The newer tools add them everywhere just in case or for consistency.

MS Access multiple left joins

Assuming you have the SELECT clause in there.

There's two errors I can see:

• You have two open brackets, and only one closed.
• You have not enclosed Receipt Date in square brackets.

The SQL should be:

SELECT *
FROM ([DFM report] LEFT JOIN [Audit report] ON [DFM report].URN = [Audit report].URN)
                   LEFT JOIN [Accounting Calendar] ON [DFM report].[Receipt Date] = [Accounting Calendar].Date  

Note: Date isn't a great name for a field as it's also a reserved word for Access.

How can I solve this Query Error in Access?

In Access, you need nested parentheses to handle multiple JOINs.

This should do it:

SELECT Maestros.Nombre AS Maestro, Materias.Nombre AS Materia
FROM (Maestros
INNER JOIN Maestros_Materias ON Maestros.id = Maestros_Materias.Maestro_id) 
INNER JOIN Materias ON Materias.id = Maestros_Materias.Materia_id
WHERE Maestros.id = 1;

Access SQL left join - access removes parenthesis

Try this:

SELECT 
    Tag.ID, Tag.Type,
    NZ((SELECT COUNT(Cable.Type) 
    FROM Cable
    WHERE Cable.Type = Tag.Type
    AND Cable.Use = "KW"),0)
FROM Tag

SQL to join multiple tables while summing and grouping

What you need to do is to create summaries of each independently on the project granularity before you join them in a final query.

This change puts all the subqueries to run inside one query.
Assuming project_id is a unique key in the project table, this means:

SELECT
    p.[project_id],
    budget_amount,
    actual_amount,
    forecast_amount
FROM
    Project AS p left join 
    (SELECT
    [project_id],
    SUM([amount]) AS budget_amount,
FROM
    Budget
GROUP BY
    [project_id]) AS b on p.project_id=b.project_id
Left join 
    (SELECT
    [project_id],
    SUM([amount]) AS actual_amount,
FROM
    Actuals
GROUP BY
    [project_id]) AS a on p.project_id = a.project_id
Left join 
    (SELECT
    [project_id],
    SUM([amount]) AS forecast_amount,
FROM
    forecast
GROUP BY
    [project_id]) AS f on p.project_id = f.project_id

The project table left joins all other summaries because it is assumed to contain a list of projects which may/may not exist in the other summaries.

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