将多个计数返回到一个查询中

Question

I am trying to return the count values into multiple columns (ORDERS_1990, ORDERS_1991) but I am receiving the error "missing keyword".

SELECT
 (SELECT COUNT(*) FROM ORDERS WHERE (ODATE BETWEEN '01-JAN-90' AND '31-DEC-90')),
 (SELECT COUNT(*) FROM ORDERS WHERE (ODATE BETWEEN '01-JAN-91' AND '31-DEC-91'))
INTO ORDERS_1990, ORDERS_1991
FROM ORDERS;

Answer 1

You're most likely getting the message because you're using SELECT ... INTO ... outside of a PLSQL block. If you just want to label the results, just name the subqueries normally;

SELECT
 (SELECT COUNT(*) FROM ORDERS 
  WHERE (ODATE BETWEEN '01-JAN-90' AND '31-DEC-90')) ORDERS_1990,
 (SELECT COUNT(*) FROM ORDERS 
  WHERE (ODATE BETWEEN '01-JAN-91' AND '31-DEC-91')) ORDERS_1991
FROM DUAL;

Answer 2

You can use condition aggregation:

SELECT SUM(CASE WHEN ODATE BETWEEN '01-JAN-90' AND '31-DEC-90' THEN 1 ELSE 0 END),
       SUM(CASE WHEN ODATE BETWEEN '01-JAN-91' AND '31-DEC-91' THEN 1 ELSE 0 END)
INTO ORDERS_1991, ORDERS_1992
FROM ORDERS;

I'm not sure why you are getting a "missing keyword" error. I would expect the error to be that you are returning too many rows. I think the following should work (assuming you are in a PL/SQL block):

SELECT (SELECT COUNT(*) FROM ORDERS WHERE (ODATE BETWEEN '01-JAN-90' AND '31-DEC-90')),
       (SELECT COUNT(*) FROM ORDERS WHERE (ODATE BETWEEN '01-JAN-91' AND '31-DEC-91'))
INTO ORDERS_1990, ORDERS_1991
FROM dual;