Re: compare date in two rows

Does your table has a primary key, or does it have just those three columns?
----- Original Message -----
From: LALIT KUMAR
To: pgsql-novice(at)postgresql(dot)org
Sent: Friday, June 17, 2011 11:17 AM
Subject: [NOVICE] compare date in two rows

Hi,
I have a table with following sample data.

Village_name Date Label

A 1991-01-31 0

A 1991-04-28 0

A 1991-07-15 0

B 2000-02-15 0

B 2000-04-13 0

B 2001-09-13 0

C 1995-07-12 0

C 1995-10-13 0

I need to update the label to 1 when the number of days between two dates(when compared with previous date) is greater than 120 for each village.

Illustration:
For village A: row 1 date will not be compared to any date.
row 2 date will be compared to row 1 date and if satisfies the condition label will be made 1.
row 3 compare to row 2 and continue this till last row for village A.

Similarly first date for village B,C.