Count an id in several tables

Question

I have a table ( table1 ) with an id. I need to know how many times this id appears in three other tables. I have created a set of sql statements that demonstrate the problem.
I have a query that works, but I imagine there must be a better way.
<snip>
-- create testing tables
CREATE TABLE TABLE1 (
TABLE1_ID NUMBER(3));
CREATE TABLE TABLE2 (
TABLE2_ID NUMBER(3),
TABLE1_ID NUMBER(3));
CREATE TABLE TABLE3 (
TABLE3_ID NUMBER(3),
TABLE1_ID NUMBER(3));
CREATE TABLE TABLE4 (
TABLE4_ID NUMBER(3),
TABLE1_ID NUMBER(3));
-- insert testing data
INSERT INTO TABLE1 VALUES (100);
INSERT INTO TABLE2 VALUES (200,100);
INSERT INTO TABLE2 VALUES (201,100);
INSERT INTO TABLE3 VALUES (300,100);
INSERT INTO TABLE3 VALUES (301,100);
INSERT INTO TABLE3 VALUES (302,100);
INSERT INTO TABLE4 VALUES (400,100);
INSERT INTO TABLE4 VALUES (401,100);
INSERT INTO TABLE4 VALUES (402,100);
INSERT INTO TABLE4 VALUES (403,100);
-- functional but ugly query
SELECT C.TABLE2_COUNT,
D.TABLE3_COUNT,E.TABLE4_COUNT
FROM (SELECT COUNT(B.TABLE1_ID) TABLE2_COUNT
FROM TABLE1 A,TABLE2 B
WHERE A.TABLE1_ID=B.TABLE1_ID) C,
(SELECT COUNT(B.TABLE1_ID) TABLE3_COUNT
FROM TABLE1 A,TABLE3 B
WHERE A.TABLE1_ID=B.TABLE1_ID) D,
(SELECT COUNT(B.TABLE1_ID) TABLE4_COUNT
FROM TABLE1 A,TABLE4 B
WHERE A.TABLE1_ID=B.TABLE1_ID) E;
-- clean up
DROP TABLE TABLE1;
DROP TABLE TABLE2;
DROP TABLE TABLE3;
DROP TABLE TABLE4;
</snip>
Any help or advice are greatly appreciated.
Thank you.
S

Answer 1

Hi,
Tubby wrote:
This should be less resource intensive than the original.
select
(select count(*) from table2 t2 where t1.TABLE1_ID = t2.TABLE1_ID) as table2_count,
(select count(*) from table3 t3 where t1.TABLE1_ID = t3.TABLE1_ID) as table3_count,  
(select count(*) from table4 t4 where t1.TABLE1_ID = t4.TABLE1_ID) as table4_count 
from table1 t1
That produces one row of oputput for every row in table1.
If table1 can have more than one row, do this:
SELECT     SUM ((SELECT COUNT(*) FROM table2 WHERE table1_id = a.table1_id))     AS table2_count
,     SUM ((SELECT COUNT(*) FROM table3 WHERE table1_id = a.table1_id))     AS table3_count
,     SUM ((SELECT COUNT(*) FROM table4 WHERE table1_id = a.table1_id))     AS table4_count
FROM     table1     a
;