2015/6/301 TransCAD Managing Data Tables

2015/6/302 Create a New Table

2015/6/303 Add a field Delete a field Change the field order Change a field name Use a display name Change a field type Change a field width Change the number of decimals Set a default value in new records Change a field format Change a field description Index a field Change the aggregation method

2015/6/304 Adding Records to a New Table

2015/6/305 Adding Records to a New Table  Adding a Fixed Number of Records –If you know how many records you want to store in the new table, you can tell TransCAD to add that number of blank records to the table.  Adding Matching Records –Use this option when you want to store additional columns of information about records or map features in a new table. The Matching Records option automatically adds one matching record for each record or feature in the original dataview.

2015/6/306 Adding Records to a New Table  Adding a Record for Each Unique Value of a Field –Use this option when you want to create a lookup table that adds new information to a map layer or dataview. To use this option, you must choose: The map layer or dataview you want to examine. The field whose values you want to use. TransCAD adds this field to the new table.

2015/6/307 Modify the Structure of a Table

2015/6/308 Working with Codes  Often a database will contain shorthand codes that have a particular meaning. Using codes saves space because long character strings are replaced with shorter codes.  To replace shorthand codes with descriptive text, you create a lookup table and attach it to the original table. A look up table is simply a table that contains the field names, the shorthand codes, and the descriptive text you eant to see displayed.

2015/6/309 Attach Codes Lookup Table – All of the column data type has to be character as well as the column contains codes

2015/6/3010

2015/6/3011 Double Click

2015/6/3012 Create a Lookup Table From a Dataview

2015/6/3013 Create a New Table from a Dataview Marking Column

2015/6/3014 Creating a Table from an Excel File

2015/6/3015

2015/6/3016 About Dictionary Files  Tables in fixed-format text, fixed-format binary, and comma- and tab- separated text format require an additional file called the dictionary file. The dictionary file serves as a header and tells TransCAD where to look in the data file for the different fields of data.  When you create a table in one of these formats, TransCAD automatically creates the dictionary file.  Dictionary files have the same file name as the data file and an extension of: –.DCT for a fixed-format text file –.DCC for a comma- or tab- separated text file –.DCB for a fixed-fromat binary file