Oracle Update statement based on a condition

I need to conditionally update a table.

Update Table1
SET date_group = 'Group1'  WHERE (Select Table1.days_old from Table1 WHERE Table1.days_old  BETWEEN 1 AND 7 ) ;

Is this syntax correct?

Thanks,
DovbermanAsked:
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Geert GOracle dbaCommented:
no, why use table1 twice ?

Update Table1
SET date_group = 'Group1'  
WHERE days_old  BETWEEN 1 AND 7  ;

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PortletPaulEE Topic AdvisorCommented:
No. Try this instead:

UPDATE Table1
SET date_group = 'Group1'
WHERE Table1.days_old BETWEEN 1 AND 7
;

Assuming days_old is an integer field
But I suspect you are performing a calculation; what is that calculation?

Syntax examples:
http://www.techonthenet.com/oracle/update.php

Documentation (10g):
http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_10007.htm
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DovbermanAuthor Commented:
Thanks,

Days_Old = To_Days(SysDate-Start_Date)

Table1 was referenced twice by mistake.  I had modified a statement that updated table 1 from rows joined in table 2.
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DovbermanAuthor Commented:
I like the comprehensive 10g link.

The final result of this task is to feed an aging report.  There are several age groups which will appear in a cross tab type report.
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DovbermanAuthor Commented:
Thank you.
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