How to subtract the sum of a column from the column of another table

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How to subtract the sum of a column from the column of another table

What I have tried:

SELECT requestformtbl.employee_name, requestformtbl.request_type, requestformtbl.total_day,
                requestformtbl.request_status, requestformtbl.admin_remark, requestformtbl.confirmed_by, requestformtbl.date_confirmed, requesttbl.max_allotment,
                (requesttbl.max_allotment - sum(requestformtbl.total_day)) as Available from requestformtbl inner join requesttbl on 
                requestformtbl.request_type = requesttbl.request_type;


error: Column 'requestformtbl.employee_name' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.


Please help, thank you!

Posted 6-Dec-19 16:50pm

Cee08

Updated 6-Dec-19 20:11pm

v3

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Visweswaran N · Accepted Answer · 2019-12-06T19:14:00

I don't know what others do but I do like this:

I have created two tables like this

create table if not exists table1(t1_col1 int);

create table if not exists table2(t2_col1 int);

and I have inserted four sample values in table1 like this,

insert into table1 values(1), (2), (3), (4);

and two sample values in table2 like this

insert into table2 values(1), (2);

Now lets see how to subtract the sum of col1 of table2 with every values in col1 of table1

select t1_col1 as original, (select sum(t2_col1) from table2) as sum, t1_col1-(select sum(t2_col1) from table2) as result from table1;

and I get result like this,

+----------+------+--------+
| original | sum  | result |
+----------+------+--------+
|        1 |    3 |     -2 |
|        2 |    3 |     -1 |
|        3 |    3 |      0 |
|        4 |    3 |      1 |
+----------+------+--------+

Or if you want to subtract sum with sum

select sum(t1_col1) - (select sum(t2_col1) from table2) as difference from table1;

which gives,

+------------+
| difference |
+------------+
|          7 |
+------------+