Divide the results of two select queries - sql

Question

I have two SQL count queries that on their own work fine, they are:
SELECT count(*) AS TOTAL_PROGRESS_BY_LINE_
FROM dbo.PID_Components_PROCESS_LINES
WHERE ISOGEN_LINE_PROGRESS_ = 'C'
RESULT: TOTAL_PROGRESS_BY_LINE_ = 26
SELECT count(*) AS TOTAL_LINES_BY_PROJECT_
FROM dbo.PID_Components_PROCESS_LINES
WHERE PROJECT_NUMBER_ = 'PJ001234'
RESULT: TOTAL_LINES_BY_PROJECT_ = 130
Now how to do I add to the query to get the percentage of 26/130??
I have a new query to go along with how to get percentages.
Here it is:
SELECT ISOGEN_LINE_PROGRESS_, PROJECT_NUMBER_,
CASE
WHEN ISOGEN_LINE_PROGRESS_ = 'A' THEN 'NOT IN MODEL'
WHEN ISOGEN_LINE_PROGRESS_ = 'B' THEN 'ROUGHED IN'
WHEN ISOGEN_LINE_PROGRESS_ = 'C' THEN 'PARTIAL CHECK'
WHEN ISOGEN_LINE_PROGRESS_ = 'D' THEN 'READY FOR FINAL CHECK'
WHEN ISOGEN_LINE_PROGRESS_ = 'E' THEN '100% COMPLETE'
WHEN ISOGEN_LINE_PROGRESS_ = '0' THEN 'ISSUE FOR CONSTRUCTION'
END AS PROGRESS_PER_LINE_
FROM PID_Components_PROCESS_LINES
WHERE PROJECT_NUMBER_ = 'PJ001234'
ORDER BY ISOGEN_LINE_PROGRESS_
this brings back results below:
ISOGEN_LINE_PROGRESS_ PROJECT_NUMBER_ PROGRESS_PER_LINE_
A PJ001234 NOT IN MODEL
B PJ001234 ROUGHED IN
C PJ001234 PARTIAL CHECK
D PJ001234 READY FOR FINAL CHECK
If I remove the Distinct from my query there are obviously multiple rows for each level of progress. How do I add to the above distinct query to have a column at the end with the rate or percent of each level of progress compared to the overall number of lines?

Answer 1

Select them as a subquery.
By default the result will be an integer because count(*) returns an int. For a decimal result convert to a decimal.
SELECT (
SELECT CONVERT(decimal(9,2),COUNT(*)) AS TOTAL_PROGRESS_BY_LINE_
FROM dbo.PID_Components_PROCESS_LINES
WHERE ISOGEN_LINE_PROGRESS_ = 'C'
) / (
SELECT CONVERT(decimal(9,2),COUNT(*)) AS TOTAL_LINES_BY_PROJECT_
FROM dbo.PID_Components_PROCESS_LINES
WHERE PROJECT_NUMBER_ = 'PJ001234'
)

Answer 2

You may use conditional aggregation and simple division in one query:
select
100.0 *
count(
case when ISOGEN_LINE_PROGRESS_ = 'C'
then 1
end
)
/
nullif(count(
case when PROJECT_NUMBER_ = 'PJ001234'
then 1
end
), 0) as rate_
FROM dbo.PID_Components_PROCESS_LINES
WHERE ISOGEN_LINE_PROGRESS_ = 'C'
or PROJECT_NUMBER_ = 'PJ001234'

Answer 3

DECLARE #firstone INT;
DECLARE #secondone INT;
SELECT #firstone = count(*)
FROM dbo.PID_Components_PROCESS_LINES
WHERE ISOGEN_LINE_PROGRESS_ = 'C';
SELECT #secondone = count(*)
FROM dbo.PID_Components_PROCESS_LINES
WHERE PROJECT_NUMBER_ = 'PJ001234';
SELECT #firstone / #secondone AS resultthing
SELECT #firstone /CAST(#secondone AS DECIMAL (9,2))

Answer 4

You could use a common table expression to get the counts and then select the desired results in one swell foop:
with Counts as (
select
( select Count(*) from Sys.Tables ) as NumberOfTables,
( select Count(*) from Sys.Columns ) as NumberOfColumns
)
select NumberOfTables, NumberOfColumns,
NumberOfColumns / NumberOfTables as ColumnsPerTable,
( 100 * NumberOfColumns ) / NumberOfTables as IntegerPercentColumnsPerTable,
( 100.0 * NumberOfColumns ) / NumberOfTables as NumericPercentColumnsPerTable
from Counts;
I used existing tables since you chose not to supply DDL and sample data. So it goes.