在oracle中使用SQL进行计算

Question

嗨我正在使用orcale，并且在表之间创建了一个连接。我现在想插入一个计算，但它一直想出了相同的错误消息“ORA-00933：SQL命令不能正确地结束” 我公司生产的代码是这个..

select "CUSTOMER"."CUST_ID" as "CUST_ID", 
"CUSTOMER"."CUST_TITLE" as "CUST_TITLE", 
"CUSTOMER"."CUST_FORENAME" as "CUST_FORENAME", 
"CUSTOMER"."CUST_SURNAME" as "CUST_SURNAME", 
"CUSTOMER"."CUST_ADDRESS_1" as "CUST_ADDRESS_1", 
"CUSTOMER"."CUST_ADDRESS_2" as "CUST_ADDRESS_2", 
"CUSTOMER"."CUST_TOWN-CITY" as "CUST_TOWN-CITY", 
"CUSTOMER"."CUST_COUNTY" as "CUST_COUNTY", 
"CUSTOMER"."CUST_POST_CODE" as "CUST_POST_CODE", 
"CUSTOMER"."CUST_TEL" as "CUST_TEL", 
"CUSTOMER"."CUST_EMAIL" as "CUST_EMAIL", 
"MENU_ITEM"."PRODUCT_PRICE" as "PRODUCT_PRICE", 
"ORDER_ITEM"."QUANTITY" as "QUANTITY", 
"ORDER_ITEM"."ORDER_ID" as "ORDER_ID", 
"ORDER_DETAILS"."ORDER_ID" as "ORDER_ID" 
from  "ORDER_DETAILS" "ORDER_DETAILS", 
"ORDER_ITEM" "ORDER_ITEM", 
"MENU_ITEM" "MENU_ITEM", 
"CUSTOMER" "CUSTOMER" 
where "ORDER_ITEM"."ORDER_ID"="ORDER_DETAILS"."ORDER_ID" 
and  "ORDER_DETAILS"."CUST_ID"="CUSTOMER"."CUST_ID" 
and  "MENU_ITEM"."MENU_ITEM_ID"="ORDER_ITEM"."MENU_ITEM_ID"` 

这是代码生成错误消息

select "CUSTOMER"."CUST_ID" as "CUST_ID", 
"CUSTOMER"."CUST_TITLE" as "CUST_TITLE", 
"CUSTOMER"."CUST_FORENAME" as "CUST_FORENAME", 
"CUSTOMER"."CUST_SURNAME" as "CUST_SURNAME", 
"CUSTOMER"."CUST_ADDRESS_1" as "CUST_ADDRESS_1", 
"CUSTOMER"."CUST_ADDRESS_2" as "CUST_ADDRESS_2", 
"CUSTOMER"."CUST_TOWN-CITY" as "CUST_TOWN-CITY", 
"CUSTOMER"."CUST_COUNTY" as "CUST_COUNTY", 
"CUSTOMER"."CUST_POST_CODE" as "CUST_POST_CODE", 
"CUSTOMER"."CUST_TEL" as "CUST_TEL", 
"CUSTOMER"."CUST_EMAIL" as "CUST_EMAIL", 
"MENU_ITEM"."PRODUCT_PRICE" as "PRODUCT_PRICE", 
"ORDER_ITEM"."QUANTITY" as "QUANTITY", 
"ORDER_ITEM"."ORDER_ID" as "ORDER_ID", 
"ORDER_DETAILS"."ORDER_ID" as "ORDER_ID" 
    from "ORDER_DETAILS" "ORDER_DETAILS", 
"ORDER_ITEM" "ORDER_ITEM", 
"MENU_ITEM" "MENU_ITEM", 
"CUSTOMER" "CUSTOMER" 
where "ORDER_ITEM"."ORDER_ID"="ORDER_DETAILS"."ORDER_ID" 
and  "ORDER_DETAILS"."CUST_ID"="CUSTOMER"."CUST_ID" 
and  "MENU_ITEM"."MENU_ITEM_ID"="ORDER_ITEM"."MENU_ITEM_ID" 
SELECT PRODUCT_PRICE, 
     QUANTITY, 
     PRODUCT_PRICE * QUANTITY AS "TOTAL SPENT" 
FROM MENU_ITEM,ORDER_ITEM 

Answer 1

SQL的问题是您的第二个“SELECT”语句将打开一个新的SQL命令。如果您想在查询中添加一个名为“TOTAL_SPENT”的新列，将PRODUCT_PRICE和QUANTITY相乘，请将其添加到主查询的SELECT列表中。添加第二个SELECT语句不会将结果合并到第一个。

你想是这样的：

select "CUSTOMER"."CUST_ID" as "CUST_ID", 
"CUSTOMER"."CUST_TITLE" as "CUST_TITLE", 
"CUSTOMER"."CUST_FORENAME" as "CUST_FORENAME", 
"CUSTOMER"."CUST_SURNAME" as "CUST_SURNAME", 
"CUSTOMER"."CUST_ADDRESS_1" as "CUST_ADDRESS_1", 
"CUSTOMER"."CUST_ADDRESS_2" as "CUST_ADDRESS_2", 
"CUSTOMER"."CUST_TOWN-CITY" as "CUST_TOWN-CITY", 
"CUSTOMER"."CUST_COUNTY" as "CUST_COUNTY", 
"CUSTOMER"."CUST_POST_CODE" as "CUST_POST_CODE", 
"CUSTOMER"."CUST_TEL" as "CUST_TEL", 
"CUSTOMER"."CUST_EMAIL" as "CUST_EMAIL", 
"MENU_ITEM"."PRODUCT_PRICE" as "PRODUCT_PRICE", 
"ORDER_ITEM"."QUANTITY" as "QUANTITY", 
"ORDER_ITEM"."ORDER_ID" as "ORDER_ID", 
"ORDER_DETAILS"."ORDER_ID" as "ORDER_ID", 
PRODUCT_PRICE * QUANTITY AS "TOTAL SPENT" 
    from "ORDER_DETAILS" "ORDER_DETAILS", 
"ORDER_ITEM" "ORDER_ITEM", 
"MENU_ITEM" "MENU_ITEM", 
"CUSTOMER" "CUSTOMER" 
where "ORDER_ITEM"."ORDER_ID"="ORDER_DETAILS"."ORDER_ID" 
and  "ORDER_DETAILS"."CUST_ID"="CUSTOMER"."CUST_ID" 
and  "MENU_ITEM"."MENU_ITEM_ID"="ORDER_ITEM"."MENU_ITEM_ID" 

根据是其他表中哪些列，你可能需要资格PRODUCT_PRICE和数量与他们的表名，像SQL其他列引用。