Question

我输入了这个：

SELECT COST TO_CHAR(COALESCE (COST, 0), '$99,990.99') 
  FROM COURSE;
SELECT COST TO_CHAR(NVL(cost, 0), '$99,990.99') COST
  FROM COURSE;

然后我收到这条消息：

SELECT COST TO_CHAR(COALESCE (COST, 0), '$99,990.99')
                   *
ERROR at line 1: 
ORA-00923: FROM keyword not found where expected 
SELECT  COST TO_CHAR(NVL(cost, 0), '$99,990.99') COST
                    *
ERROR at line 1: 
ORA-00923: FROM keyword not found where expected

我试图以特定的格式获得课程的费用：

COST
-------------
 $0.00
 $1,000.00

任何帮助将不胜感激

Answer 1

查询应该是这样的：

SELECT  TO_CHAR(COALESCE (COST, 0), '$99,990.99') FROM COURSE;
SELECT  TO_CHAR(NVL(cost, 0), '$99,990.99')  FROM COURSE;

SELECT语句中有太多COST个关键字。

如果您希望在格式化时保留COST列，请添加以下逗号：

SELECT COST, TO_CHAR(COALESCE (COST, 0), '$99,990.99') COST_FORMATTED FROM COURSE;
SELECT COST, TO_CHAR(NVL(cost, 0), '$99,990.99') COST_FORMATTED FROM COURSE;

Answer 2

您在第一个COST之后缺少逗号：

SELECT COST, TO_CHAR(COALESCE (COST, 0), '$99,990.99') FROM COURSE; 
SELECT COST, TO_CHAR(NVL(cost, 0), '$99,990.99') FROM COURSE;

如果选择开头费用，则将第二列命名为COST是没有意义的。

继续收到此消息：*第1行的错误：ORA-00923：FROM关键字未找到时

2 个答案: