v.db.select - Prints vector map attributes.
vector, attribute table, database, SQL
v.db.select
v.db.select --help
v.db.select [-
rcvf]
map=
name
[
layer=
string] [
columns=
name[,
name,...]]
[
where=
sql_query] [
group=
string]
[
separator=
character]
[
vertical_separator=
character] [
null_value=
string] [
file=
name]
[--
overwrite] [--
help] [--
verbose] [--
quiet]
[--
ui]
- -r
-
Print minimal region extent of selected vector features instead of
attributes
- -c
-
Do not include column names in output
- -v
-
Vertical output (instead of horizontal)
- -f
-
Exclude attributes not linked to features
- --overwrite
-
Allow output files to overwrite existing files
- --help
-
Print usage summary
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
- --ui
-
Force launching GUI dialog
- map=name [required]
-
Name of vector map
Or data source for direct OGR access
- layer=string
-
Layer number or name
Vector features can have category values in different layers. This number
determines which layer to use. When used with direct OGR access this is
the layer name.
Default: 1
- columns=name[,name,...]
-
Name of attribute column(s)
- where=sql_query
-
WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000
- group=string
-
GROUP BY conditions of SQL statement without ’group by’
keyword
- separator=character
-
Field separator
Special characters: pipe, comma, space, tab, newline
Default: pipe
- vertical_separator=character
-
Output vertical record separator
Special characters: pipe, comma, space, tab, newline
- null_value=string
-
String representing NULL value
- file=name
-
Name for output file (if omitted or "-" output to stdout)
v.db.select prints attributes of a vector map from one or several user
selected attribute table columns.
All examples are based on the North Carolina sample dataset.
v.db.select map=roadsmajor
cat|MAJORRDS_|ROAD_NAME|MULTILANE|PROPYEAR|OBJECTID|SHAPE_LEN
1|1|NC-50|no|0|1|4825.369405
2|2|NC-50|no|0|2|14392.589058
3|3|NC-98|no|0|3|3212.981242
4|4|NC-50|no|0|4|13391.907552
...
Note: multiple columns can be specified as comma separated list.
v.db.select map=roadsmajor column=ROAD_NAME
NC-50
NC-50
NC-98
NC-50
NC-98
...
v.db.select -r map=roadsmajor where="ROAD_NAME = ’NC-98’"
n=248425.389891
s=245640.640081
w=635906.517653
e=661979.801880
v.db.select geonames_wake where="ALTERNATEN IS NULL"
cat|GEONAMEID|NAME|ASCIINAME|ALTERNATEN|FEATURECLA|FEATURECOD|...
8|4498303|West Raleigh|West Raleigh||P|PPL|US||NC|338759|123|...
14|4459467|Cary|Cary||P|PPL|US||NC|103945|146|152|America/Iqaluit|...
31|4452808|Apex|Apex||P|PPL|US||NC|30873|167|134|America/Iqaluit|...
...
v.db.select geonames_wake where="ALTERNATEN IS NOT NULL"
cat|GEONAMEID|NAME|ASCIINAME|ALTERNATEN|FEATURECLA|FEATURECOD|...
9|4487042|Raleigh|Raleigh|Raleigh,...
31299|4487056|Raleigh-Durham Airport|Raleigh-Durham Airport|...
...
v.db.select map=roadsmajor columns=ROAD_NAME group=ROAD_NAME
ROAD_NAME
I-40
I-440
I-540
NC-231
NC-39
NC-42
...
It is also possible to combine with
where option
v.db.select map=roadsmajor columns=ROAD_NAME,MULTILANE group=ROAD_NAME where=’ROAD_NAME is not null’
ROAD_NAME|MULTILANE
I-40|yes
I-440|yes
I-540|yes
NC-231|no
NC-39|no
NC-42|no
NC-50|no
NC-54|no
NC-55|no
NC-96|no
NC-97|no
NC-98|no
US-1|
US-401|no
US-64|yes
US-70|yes
It can also use more columns in
group option
v.db.select map=roadsmajor columns=ROAD_NAME,MULTILANE group=ROAD_NAME,MULTILANE where=’ROAD_NAME is not null’
ROAD_NAME|MULTILANE
I-40|yes
I-440|yes
I-540|yes
NC-231|no
NC-39|no
NC-42|no
NC-50|no
NC-54|no
NC-55|no
NC-96|no
NC-97|no
NC-98|no
US-1|
US-1|yes
US-401|no
US-401|yes
US-64|yes
US-70|yes
db.select
Radim Blazek, ITC-Irst, Trento, Italy
Minimal region extent added by Martin Landa, FBK-irst (formerly ITC-irst),
Trento, Italy (2008/08)
Group option added by Luca Delucchi, Fondazione Edmund Mach, Trento, Italy
(2015/12)
Last changed: $Date: 2016-10-27 23:20:55 +0200 (Thu, 27 Oct 2016) $
Available at: v.db.select source code (history)
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