ICT data types 0.0 / 5 ? ComputingData typesIGCSEOther Created by: Splash HeslinCreated on: 17-12-14 11:51 File A full set of data. 1 of 26 Record A file split into sets of data (the rows) 2 of 26 Item A single piece of data in a record. 3 of 26 Field Where items are stored in different categories (the columns) 4 of 26 Key field A field where each item in a record is unique. 5 of 26 Sequential file Records in a file that are in some sort of order. 6 of 26 Serial file If the records in a file are in no order, even if the files are in order of input. 7 of 26 Index Tells you where to find a record, and it is in order. 8 of 26 Direct access file A serial file with an index. 9 of 26 Data types Certain boundaries within a field, that the items must be within. 10 of 26 Numeric data types (list) Integers, real numbers. 11 of 26 Alphanumeric data types Text. 12 of 26 Logical/ Boolean data types Can only be one of two characters, e.g. Y or N 13 of 26 Currency A real number, but can only have two digits. 14 of 26 Validation Rules about the format, range, or length of the data in a field. 15 of 26 Validation check Testing whether the data follows the rules: length check, character check, format check, presence check. 16 of 26 Data verification Compares the output to the original to make sure they match, or they input the data twice. 17 of 26 Flat file All the data is stored in one file. 18 of 26 Secondary key An additional key to the primary key. 19 of 26 Table Another name for a file. 20 of 26 Relation tables Files that are related to each other. 21 of 26 Foreign key A field in one file, that is also the key field in another file. 22 of 26 Analogue data Data that can have any value within a defined range. 23 of 26 Digital data Data in the form of unique patterns of 0s and 1s (bits, bytes) 24 of 26 Analogue-to-digital converter A devise that converts analogue data to digital. 25 of 26 Digital-to-analogue converter A devise that converts digital data to analogue data. 26 of 26
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