Web Reference: Feb 20, 2026 · Data diff is the process of comparing two sets of data to identify changes, mismatches, and drift; it can operate at row, record, field, or aggregate levels. Analogy: Like reconciling two bank statements to find missing transactions and errors. Jul 12, 2024 · This article explores how to use `diff` to compare files line by line in Linux. It covers the basic syntax, important options like context mode and unified mode, and practical applications such as creating patch files and recursively comparing directories. In this example, running data-diff --conf myconfig.toml --run test_diff will compare between rating and rating_del1. It will use the timestamp column as the update column, as specified in run.default.
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