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How use a 'Wild Card' for
Attribute Selections
Often it is
desirable to select a group of features that all have similar, but not
identical, attributes. For example, you might want to select all of the parks
from a series of features. Obviously, if there is a 'Type' field in the database
listing all of the different parks as Type = Park the selection is easy. If not,
the use of a 'wild card' in the selection query can sometimes achieve the same
goal. A wild card accepts any letter or combination of letters
Note that wild
cards can be used with Select by Attribute, Definition Queries and Label class
queries (all of which use the same basic SQL syntax wizard).
Given a database
with the following features:
ID |
Name |
Ownership |
1 |
Oak Park |
City |
2 |
Bus Terminal |
county |
3 |
Larabee Park |
State |
4 |
Bellingham Airport |
City |
5 |
Park by the Bay |
City |
5 |
Marine Park |
City |
To select all of
the parks:
"Name" Like '%Park%'
Note that the % symbols, when
used with the Like operator, will select any record with the word 'Park'
anywhere in the Name field. If you want only records that start with the word
Park, you could use "Name" Like 'Park%'. If you wanted only records that
end with the work park you could use: "Name" Like '%Park'.
Watch out for other features that may
have similar names. For example, if you had a feature in the database named
'Downtown Parking Lot' it also would be selected by the "Name" Like '%Park%'
query.
Be sure you have
a space before and after the Like operator in your SQL expression.
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