Hi in the main page about geometric operations said:
It is possible to access the two component numbers of a point as though it
were an array with indices 0 and 1. For example, if t.p is a point column
then SELECT p[0] FROM t retrieves the X coordinate and UPDATE t SET p[1] =
... changes the Y coordinate. In the same way, a value of type box or lseg
can be treated as an array of two point values.
1st. i have a field
Column | Type | Modifiers
-----------+-----------------------+-------------------------------
id | integer | not null
info | lseg |
After read the above, i tried to
select info from table limit 1;
info
----------------------------------------------------
[(647753.125,2825633.75),(647738.8125,2825626.75)]
the value i want to get is:647753.125
so i tried to do:
select info[0] from table limit 1;
info
-------------------------
(647753.125,2825633.75)
i still want to get647753.125, so i did:
select info[0][0] from table limit 1;
info
------
(1 row)
But, nothing appears like a NULL.
then i did:
select point(info[0])[0] from table limit 1;
ERROR: syntax error at or near "["
LINE 1: select point(info[0])[0] from table limit 1;
and finally i wrote this mail :-)
Regards.
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