[英]MySQL query: How to fix Error 1052 (ambiguous column)
I keep getting an error when I run both of the following queries that the CUST_NUM is ambiguous. 当我同时运行以下两个查询时,我总是收到错误消息:CUST_NUM不明确。 How can I fix this? 我怎样才能解决这个问题?
SELECT INV_NUM, CUST_NUM, CUST_LNAME, CUST_FNAME, INV_DATE, INV_AMOUNT
FROM CH08_INVOICE i
INNER JOIN CH08_CUSTOMER c1 ON (i.CUST_NUM = c1.CUST_NUM)
WHERE CUST_BALANCE>=1000;
SELECT CUST_LNAME, CUST_FNAME
FROM CH08_CUSTOMER c1 JOIN CH08_CUSTOMER_2 c2
ON (c1.CUST_LNAME = c2.CUST_LNAME AND c1.CUST_FNAME = c2.CUST_FNAME);
SELECT i.INV_NUM, i.CUST_NUM, i.CUST_LNAME, i.CUST_FNAME, i.INV_DATE, i.INV_AMOUNT FROM CH08_INVOICE i INNER JOIN CH08_CUSTOMER c1 ON (i.CUST_NUM = c1.CUST_NUM) WHERE i.CUST_BALANCE>=1000;
SELECT c1.CUST_LNAME, c1CUST_FNAME FROM CH08_CUSTOMER c1 JOIN CH08_CUSTOMER_2 c2 ON (c1.CUST_LNAME = c2.CUST_LNAME AND c1.CUST_FNAME = c2.CUST_FNAME);
Please check this query 请检查此查询
Ambiguous column means the database don't know which table it must use the column. 列不明确意味着数据库不知道它必须使用哪个表。
Try using 尝试使用
SELECT INV_NUM, i.CUST_NUM ...
or 要么
SELECT INV_NUM, c1.CUST_NUM ...
for explicity defining the table. 明确定义表格。
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