Table formatsArcGIS reads table in many formats:
dBase format (shapefile) INFO format (workstation ArcInfo)Geodatabase table (MS Access in
case of personal geodatabaseText file (comma or tab-delimited
meaning field separated by commas)
Tables• Tables contain attribute data• Many formats, one interface
Table Properties
How do you display 2 tables side by side?
Fields• Fields have specific types available• Must be defined before use• Once defined, cannot be changed
Field types in TablesExample:
Name: SueDOB: 5/15/1985Weight: 135 lbHeight: 5.7 feetSS#: 222555999
Text Date Short Long BLOB FloatSue 5/15/1985 135 222555999 5.7
Field characteristics• Length
– The total characters a text field can storeLength = 10Maple St.Maple Stre
Field characteristics
Precision 3: 256Precision 8: 1965.128Precision 10: -1922.5500
Scale 3: 0.001Scale 5: 0.00001
• Precision–The total width of digits a numeric field can store
• Scale–The number of decimal places
Scale & PrecisionWhen defining a number field (float & double), designate a storage width (precision) and the number of decimal places (scale)
SQL Queries
What is this map showing?
How do I select all the Democratic districts?
How do I select all the Democratic districts?
True or False?• A field named AREA in a shapefile will always have
the correct area?– False.
• A field named AREA in a Geodatabase will always have the correct area?– False.
