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Overview
Comment:Fix a minor error in the datatype documentation.
Timelines: family | ancestors | branch-3.27
Files: files | file ages | folders
SHA3-256:87bef3d12399d901f912022a4ff616bf66c3daedf18b24f6cbb5d55f8f474ad4
User & Date: drh 2019-04-08 18:08:43
Context
2019-04-08
18:08
Fix a minor error in the datatype documentation. Leaf check-in: 87bef3d123 user: drh tags: branch-3.27
18:06
Fix a minor error in the datatype documentation. check-in: a5590f5f81 user: drh tags: trunk
2019-04-01
14:44
Improvements to VACUUM documentation - describe more clearly when another transaction might block a vacuum. check-in: 0f897a0268 user: drh tags: branch-3.27
Changes
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Changes to pages/datatype3.in.

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<blockquote><pre>
CREATE TABLE t1(a INT, b TEXT, c REAL);
CREATE VIEW v1(x,y,z) AS SELECT b, a+c, 42 FROM t1 WHERE b!=11;
</pre></blockquote>

<p>The affinity of the v1.x column will be the same as the affinity
of t1.b (INTEGER), since v1.x maps directly into t1.b.  But
columns v1.y and v1.z both have no affinity, since those columns
map into expression a+c and 42, and expressions always have no
affinity.

<p>When the [SELECT] statement that implements a [VIEW] or 
FROM-clause subquery is a [compound SELECT] then the affinity of 
each supposed column of the VIEW or subquery will







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<blockquote><pre>
CREATE TABLE t1(a INT, b TEXT, c REAL);
CREATE VIEW v1(x,y,z) AS SELECT b, a+c, 42 FROM t1 WHERE b!=11;
</pre></blockquote>

<p>The affinity of the v1.x column will be the same as the affinity
of t1.b (TEXT), since v1.x maps directly into t1.b.  But
columns v1.y and v1.z both have no affinity, since those columns
map into expression a+c and 42, and expressions always have no
affinity.

<p>When the [SELECT] statement that implements a [VIEW] or 
FROM-clause subquery is a [compound SELECT] then the affinity of 
each supposed column of the VIEW or subquery will