Question

我正在尝试将计数值返回到多个列（ORDERS_1990，ORDERS_1991）但我收到错误＆＃34;缺少关键字＆＃34;。

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

您最有可能收到消息，因为您在PLSQL块之外使用SELECT ... INTO ...。如果您只想标记结果，只需正常命名子查询;

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

您可以使用条件聚合：

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;

我不确定为什么你会得到一个＆＃34;缺少关键字＆＃34;错误。我希望错误是你返回太多行。我认为以下内容应该有效（假设您在PL / SQL块中）：

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;

将多个计数返回到一个查询中

2 个答案: