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Editorial Team
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Asked: 2026-06-03T14:45:20+00:00

Here’s a SQL statement that works perfectly in Transact-sql SELECT a.Account_ID, a.First_Name, a.Last_Name, m.number

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Here’s a SQL statement that works perfectly in Transact-sql

SELECT a.Account_ID, a.First_Name, a.Last_Name, m.number
FROM Account a,
(SELECT R_Account_ID, COUNT(Notification_ID) AS number
FROM Rcv_Send_Event_Notf 
GROUP BY R_Account_ID) m
WHERE a.Account_ID = m.R_Account_ID

But it does not in Oracle. It is complaining about m.number in out most select statement. I believe also because of AS number in the 3rd line.

invalid user.table.column, table.column, or column specification…

Is there a different way to alias a column in Oracle?

Thanks for helping

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1 Answer

  1. Editorial Team

    Number is a keyword in Oracle, so you can’t use it as an alias without using double quotes. Most would advise against using it as an alias, period.

    > select d.number from (select sysdate as number from dual) d

Error starting at line 3 in command:
select d.number from (select sysdate as number from dual) d
Error at Command Line:3 Column:9
Error report:
SQL Error: ORA-01747: invalid user.table.column, table.column, or column specification
01747. 00000 -  "invalid user.table.column, table.column, or column specification"

> select d.number from (select sysdate as "number" from dual) d

Error starting at line 2 in command:
select d.number from (select sysdate as "number" from dual) d
Error at Command Line:2 Column:9
Error report:
SQL Error: ORA-01747: invalid user.table.column, table.column, or column specification
01747. 00000 -  "invalid user.table.column, table.column, or column specification"

> select d."number" from (select sysdate as "number" from dual) d
number                    
------------------------- 
07-MAY-12 12:32:28 PM
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