Question

Qns ：项目描述和任何名为Jessie Stange的患者的治疗日期（即GivenName是Jessie＆amp; FamilyName是Stange）

我写的：

SELECT DISTINCT Description, Date as treatmentDate
WHERE doothey.Patient P, doothey.Account A, doothey.AccountLine AL, doothey.Item.I
AND P.PatientID = A.PatientID
AND A.AccountNo = AL.AccountNo
AND AL.ItemNo = I.ItemNo
AND (p.FamilyName = 'Stange' AND p.GivenName = 'Jessie');

错误：

Error at Command Line:1 Column:30
Error report:
SQL Error: ORA-00936: missing expression
00936. 00000 -  "missing expression"
*Cause:    
*Action:

缺少什么表达？

Answer 1

您的语句正在调用SELECT和WHERE，但未指定您要选择哪个TABLE或记录集。

SELECT DISTINCT Description, Date as treatmentDate
FROM (TABLE_NAME or SUBQUERY)<br> --This is missing from your query.
WHERE doothey.Patient P, doothey.Account A, doothey.AccountLine AL, doothey.Item.I
AND P.PatientID = A.PatientID
AND A.AccountNo = AL.AccountNo
AND AL.ItemNo = I.ItemNo
AND (p.FamilyName = 'Stange' AND p.GivenName = 'Jessie');

Answer 2

你犯了两个错误。我认为你错放了FROM和WHERE关键字。

SELECT DISTINCT Description, Date as treatmentDate
     FROM doothey.Patient P, doothey.Account A, doothey.AccountLine AL,  doothey.Item.I --Here you use "." operator to "I" alias 
  WHERE  -- WHERE should be located here. 
   P.PatientID = A.PatientID
    AND A.AccountNo = AL.AccountNo
    AND AL.ItemNo = I.ItemNo
    AND (p.FamilyName = 'Stange' AND p.GivenName = 'Jessie');

Answer 3

在上面的查询中，当我们尝试组合两个或多个表时，必须使用连接并指定描述和日期的别名（即，从中获取描述和日期值的表）< / p>

SELECT DISTINCT Description, Date as treatmentDate  
FROM doothey.Patient P  
INNER JOIN doothey.Account A ON P.PatientID = A.PatientID  
INNER JOIN doothey.AccountLine AL ON A.AccountNo = AL.AccountNo  
INNER JOIN doothey.Item I ON AL.ItemNo = I.ItemNo  
WHERE p.FamilyName = 'Stange' AND p.GivenName = 'Jessie';

Answer 4

您没有对表使用 FROM 表达式

SELECT DISTINCT Description, Date as treatmentDate
**FROM <A TABLE>**
WHERE doothey.Patient P, doothey.Account A, doothey.AccountLine AL, doothey.Item.I
AND P.PatientID = A.PatientID
AND A.AccountNo = AL.AccountNo
AND AL.ItemNo = I.ItemNo
AND (p.FamilyName = 'Stange' AND p.GivenName = 'Jessie');

Answer 5

  1  

     select ename as name,
      2  sal as salary,
      3  dept,deptno,
      4   from (TABLE_NAME or SUBQUERY)
      5   emp, emp2,  dept
      6    where
      7   emp.deptno = dept.deptno and
      8   emp2.deptno = emp.deptno
      9*  order by dept.dname

 from (TABLE_NAME or SUBQUERY)
 *
ERROR at line 4:
ORA-00936: missing expression`  select ename as name,
 sal as salary,
 dept,deptno,
  from (TABLE_NAME or SUBQUERY)
  emp, emp2,  dept
   where
  emp.deptno = dept.deptno and
  emp2.deptno = emp.deptno
  order by dept.dname`

SQL错误：ORA-00936：缺少表达式

5 个答案: