Question

I am having a problem with trying to count a number of rows and then grouping them in SQL.

I have used the SELECT query below to create a table.

SELECT ward.ward_no, bed_no   
FROM ward, bed 
WHERE ward.ward_no = bed.ward_no

.

ward_no     bed_no

w1         1.
w1         2.
w1         3.    
w1         4.    
w2         5.    
w2         6.    
w2         7.   
w3         8.    
w3         9.    
w3         10.   
w4         11.

What I am trying to do is create a table where it shows each ward no ie w1 and a field showing how many fields is in it.

eg.

w1   3.
w2   3.
w3   3

I have tried the COUNT & GROUP BY fields like so…

SELECT ward.ward_no, bed_no
FROM ward, bed  
WHERE ward.ward_no = bed.ward_no  
AND COUNT (bed_no) AS beds_in_ward  
GROUP BY ward_no;

but with no joy, any advice would be fully appreciated

Answer 1

You have your COUNT() in the wrong place

SELECT ward.ward_no, COUNT (bed_no) AS beds_in_ward
FROM ward
INNER JOIN bed
ON ward.ward_no = bed.ward_no
GROUP BY ward_no;

I also updated the query to use JOIN instead of the ',' between your tables.