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-- Formatting purpose
SET LINESIZE 200
COLUMN 'Pharmaceutical Companies' FORMAT a25
COLUMN 'Drug Count' FORMAT a10
-- Code
SELECT PHARNAME AS "Pharmaceutical Companies", COUNT (tradename) AS "Drug Count"
FROM DRUG
GROUP BY PHARNAME
HAVING COUNT (TRADENAME) = (SELECT MAX ("Drug Count")
FROM (SELECT COUNT (TRADENAME) AS "Drug Count" FROM DRUG
GROUP BY PHARNAME));
以上是我的一套代码来获取我的数据库中的某些值。然而,打印的结果是什么导致我的价值被打印为#
Pharmaceutical Companies Drug Count
------------------------- ----------
Medmed Shine ##########
如果我删除格式目的,它会显示
Pharmaceutical Companies Drug Count
------------------------------ ----------
Medmed Shine 14
我试图调整格式的大小,但它仍显示为########
你为什么要使用一个文本字段格式 - A10 - 为多少?你想如何显示数字值? (另外,[见此](http://docs.oracle.com/cd/E11882_01/server.112/e16604/ch_twelve013.htm#sthref1308))。 –
'A ...'是错误的格式,您需要'9999999999'([link](http://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12013.htm#BACHCABF)) – dasblinkenlight
@AlexPoole新来的sql,不知道'a10'是只为字符串,谢谢指导 – Zac