EXPLAIN - Sequential Scan


This is the simplest way of fetching data from a table: it scans through every page of data sequentially. Like most other scans, this can apply a filter while reading data, but it needs to read the data first and then discard it. A sequential scan has no way to zero in on just the data you want: it always reads everything in the table. This is generally inefficient unless you need a large proportion of the table to answer your query, but is always available and sometimes may be the only option.

Important Fields:

  • Filter
  • Rows Removed by Filter

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