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[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
IETF RFC 4180 (summarized above) defines the format for the "text/csv" MIME type registered with the IANA. Rules typical of these and other "CSV" specifications and implementations are as follows: CSV is a delimited data format that has fields/columns separated by the comma character and records/rows terminated by newlines.
For example, a table of 128 rows with a Boolean column requires 128 bytes a row-oriented format (one byte per Boolean) but 128 bits (16 bytes) in a column-oriented format (via a bitmap). Another example is the use of run-length encoding to encode a column.
Max table size Max row size Max columns per row Max Blob/Clob size Max CHAR size Max NUMBER size Min DATE value Max DATE value Max column name size Informix Dynamic Server: ≈0.5 YB 12: ≈0,5YB 12: 32,765 bytes (exclusive of large objects) 32,765 4 TB 32,765 14: 10 125 13: 01/01/0001 10: 12/31/9999 128 bytes Ingres: Unlimited Unlimited 256 KB ...
The type and length are fixed in size (typically 1–4 bytes), and the value field is of variable size. These fields are used as follows: Type A binary code, often simply alphanumeric, which indicates the kind of field that this part of the message represents; Length The size of the value field (typically in bytes); Value
First public release date Year of latest stable version Windows Macintosh Linux Other platforms Max supported file size Beyond Compare: Scooter Software [1] No; Proprietary: No 1996 2025-01-15 (v5.0.5) Yes Yes Yes > 2GB (64 bits) Compare++: Coode Software [2] No; Proprietary No 2010 2016-7-17 (3.0.1.0b) Yes [3] No No diff, diff3: AT&T
Comparing text files or computer programs, many tools use a side-by-side visual comparison. [5] This gives the user the chance to choose which changes to keep or reject before merging the files into a new version. [ 6 ]
The vast majority of text comparison software based on the longest common subsequence problem algorithm incorrectly report moved text as unlinked additions and deletions. The algorithm only reports the longest in-order run of text between two documents. Text moved out of the longest run of similarities is missed. Heuristics are not used. Any ...