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Overview
Comment:Fix typo in the query planner documentation.
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SHA3-256: f246e9b5897fc75ab462e4d64ce163b86ec691a4b5dcaeeb73fd8efa6e395c77
User & Date: drh 2020-05-21 19:16:40.738
Context
2020-05-22
11:43
Update testing metrics. (check-in: f09dcc9b65 user: drh tags: trunk)
2020-05-21
19:16
Fix typo in the query planner documentation. (Leaf check-in: c3875b77fa user: drh tags: branch-3.31)
19:16
Fix typo in the query planner documentation. (check-in: f246e9b589 user: drh tags: trunk)
2020-05-20
17:42
Documentation updates based on code review. (check-in: 0bdeed702c user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to pages/queryplanner.in.
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<tcl>code {
SELECT price FROM fruitsforsale WHERE rowid=4;
}</tcl>

<p>
Since the information is stored in the table in rowid order, SQLite
can find the correct row using a binary search.
If the table contains N element, the time required to look up the
desired row is proportional to logN rather than being proportional
to N as in a full table scan.  If the table contains 10 million elements,
that means the query will be on the order of N/logN or about 1 million
times faster.
</p>

<tcl>figure 3 #fig3 rowidlu.gif {Lookup By Rowid}</tcl>








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144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

<tcl>code {
SELECT price FROM fruitsforsale WHERE rowid=4;
}</tcl>

<p>
Since the information is stored in the table in rowid order, SQLite
can find the correct row using a binary search.
If the table contains N elements, the time required to look up the
desired row is proportional to logN rather than being proportional
to N as in a full table scan.  If the table contains 10 million elements,
that means the query will be on the order of N/logN or about 1 million
times faster.
</p>

<tcl>figure 3 #fig3 rowidlu.gif {Lookup By Rowid}</tcl>
︙︙