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Editorial Team
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Asked: 2026-05-17T15:00:42+00:00

I have the following database schema (names changed to protect the innocent) Code Table

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I have the following database schema (names changed to protect the innocent)

Code Table

| code_id | code_desc |
|---------|-----------|
| 1       | good      |
|---------|-----------|
| 2       | bad       |
|---------|-----------|
| 3       | ugly      |
|---------|-----------|

Foo Table                               AssignedFoo Table

| foo_id | foo_desc | foo_dt    |       | assn_id | foo_id | code_id |
|--------|----------|-----------|       |---------|--------|---------|
| 101    | red      | 1/1/2000  |       | 301     | 101    | 1       |
|--------|----------|-----------|       |---------|--------|---------|
| 102    | green    | 6/1/2000  |       | 302     | 102    | 2       |
|--------|----------|-----------|       |---------|--------|---------|
| 102    | blue     | 12/1/2000 |
|--------|----------|-----------|

Bar Table                               AssignedBar Table

| bar_id | bar_desc | bar_dt    |       | assn_id | foo_id | code_id |
|--------|----------|-----------|       |---------|--------|---------|
| 201    | gold     | 12/1/2000 |       | 401     | 201    | 1       |
|--------|----------|-----------|       |---------|--------|---------|
| 202    | silver   | 1/1/2001  |       | 402     | 202    | 3       |
|--------|----------|-----------|       |---------|--------|---------|
| 202    | bronze   | 6/1/2001  |
|--------|----------|-----------|

I want to count the number of records that are mapped to the Code table regardless if they’re foos or bars. I had though that the following query would work.

SELECT
    COUNT(c.code_id) AS coded,
    c.code_desc
FROM 
    code c
    INNER JOIN assignedfoo af ON af.code_id = c.code_id
    INNER JOIN foo f ON f.foo_id = af.foo_id
WHERE
    f.foo_dt >= [start date] AND 
    f.foo_dt <= [end date]
GROUP BY 
    c.code_desc

UNION ALL   

SELECT
    COUNT(c.code_id) AS coded,
    c.code_desc
FROM 
    code c
    INNER JOIN assignedbar ab ON ab.code_id = c.code_id
    INNER JOIN bar b ON b.bar_id = ab.bar_id
WHERE
    b.bar_dt >= [start date] AND 
    b.bar_dt <= [end date]
GROUP BY 
    c.code_desc

Unfortunately, I get the following result set

| coded | code_desc |
|-------|-----------|
| 1     | good      |
|-------|-----------|
| 1     | good      |
|-------|-----------|
| 1     | bad       |
|-------|-----------|
| 1     | ugly      |
|-------|-----------|

What I want to get is this 

| coded | code_desc |
|-------|-----------|
| 2     | good      |
|-------|-----------|
| 1     | bad       |
|-------|-----------|
| 1     | ugly      |
|-------|-----------|

Any suggestions about how to fix this?

Any help would be greatly appreciated.

Thanks!

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1 Answer

  1. Editorial Team

    I think you simply need to move the group by/count outside of your union like this:

    select count(a.code_id) as Coded, a.code_desc
from (
SELECT
    c.code_id,
    c.code_desc
FROM 
    code c
    INNER JOIN assignedfoo af ON af.code_id = c.code_id
    INNER JOIN foo f ON f.foo_id = af.foo_id
WHERE
    f.foo_dt >= [start date] AND 
    f.foo_dt <= [end date]

UNION ALL   

SELECT
    c.code_id,
    c.code_desc
FROM 
    code c
    INNER JOIN assignedbar ab ON ab.code_id = c.code_id
    INNER JOIN bar b ON b.bar_id = ab.bar_id
WHERE
    b.bar_dt >= [start date] AND 
    b.bar_dt <= [end date]
) a
group by a.code_desc
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