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Overview
| Comment: | Preliminary documentation for the enhancements to index_info and index_xinfo to support viewing the on-disk representation of WITHOUT ROWID tables. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
296e23a4b8d6decb27b1f9fb29c0d205 |
| User & Date: | drh 2019-07-17 13:02:07 |
Context
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2019-07-26
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| 20:22 | Update the checklist.tcl script to align with the latest code on the website. check-in: ef7dae4ce8 user: drh tags: trunk | |
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2019-07-17
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| 13:02 | Preliminary documentation for the enhancements to index_info and index_xinfo to support viewing the on-disk representation of WITHOUT ROWID tables. check-in: 296e23a4b8 user: drh tags: trunk | |
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2019-07-15
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| 19:25 | Update syntax diagrams to show the FILTER clause on aggregate functions. Start a change log for version 3.30.0. check-in: ba9800704d user: drh tags: trunk | |
Changes
Changes to pages/changes.in.
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set aChng($nChng) [list $date $desc $options]
set xrefChng($date) $nChng
incr nChng
}
chng {2019-10-00 (3.30.0)} {
<li> Add support for the [FILTER clause on aggregate functions].
}
chng {2019-07-10 (3.29.0)} {
<li> Added the [SQLITE_DBCONFIG_DQS_DML] and [SQLITE_DBCONFIG_DQS_DDL]
actions to [sqlite3_db_config()] for activating and deactivating
the [double-quoted string literal] misfeature. Both default to "on"
for legacy compatibility, but developers are encouraged to turn them
|
> > > |
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set aChng($nChng) [list $date $desc $options]
set xrefChng($date) $nChng
incr nChng
}
chng {2019-10-00 (3.30.0)} {
<li> Add support for the [FILTER clause on aggregate functions].
<li> The [index_info] and [index_xinfo] pragmas are enhanced to provide
information about the on-disk representation of [WITHOUT ROWID]
tables.
}
chng {2019-07-10 (3.29.0)} {
<li> Added the [SQLITE_DBCONFIG_DQS_DML] and [SQLITE_DBCONFIG_DQS_DDL]
actions to [sqlite3_db_config()] for activating and deactivating
the [double-quoted string literal] misfeature. Both default to "on"
for legacy compatibility, but developers are encouraged to turn them
|
Changes to pages/pragma.in.
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<p>Output columns from the index_info pragma are as follows:
<ol>
<li>^(The rank of the column within the index. (0 means left-most.))^
<li>^The rank of the column within the table being indexed.
<li>^The name of the column being indexed.
</ol>
}
Pragma index_xinfo {
<p>^(<b>PRAGMA DB.index_xinfo(</b><i>index-name</i><b>);</b></p>
<p>This pragma returns information about every column in an index.)^
^(Unlike this [index_info pragma], this pragma returns information about
every column in the index, not just the key columns.)^
................................................................................
<li>^1 if the index-column is sorted in reverse (DESC) order by the
index and 0 otherwise.
<li>^The name for the [collating sequence]
used to compare values in the index-column.
<li>^1 if the index-column is a key column and 0 if the index-column
is an auxiliary column.
</ol>
}
Pragma index_list {
<p>^(<b>PRAGMA DB.index_list(</b><i>table-name</i><b>);</b></p>
<p>This pragma returns one row for each index associated with the
given table.)^
<p>Output columns from the index_list pragma are as follows:
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<p>Output columns from the index_info pragma are as follows:
<ol>
<li>^(The rank of the column within the index. (0 means left-most.))^
<li>^The rank of the column within the table being indexed.
<li>^The name of the column being indexed.
</ol>
<p>If there is no index named <i>index-name</i> but there is a
[WITHOUT ROWID] table name <i>index_name</i>, then (as of
SQLite [version 3.30.0] on [dateof:3.30.0]) this pragma returns the
PRIMARY KEY columns of the WITHOUT ROWID table as they are used
in the records of the underlying b-tree, which is to say with
duplicate columns removed.
}
Pragma index_xinfo {
<p>^(<b>PRAGMA DB.index_xinfo(</b><i>index-name</i><b>);</b></p>
<p>This pragma returns information about every column in an index.)^
^(Unlike this [index_info pragma], this pragma returns information about
every column in the index, not just the key columns.)^
................................................................................
<li>^1 if the index-column is sorted in reverse (DESC) order by the
index and 0 otherwise.
<li>^The name for the [collating sequence]
used to compare values in the index-column.
<li>^1 if the index-column is a key column and 0 if the index-column
is an auxiliary column.
</ol>
<p>If there is no index named <i>index-name</i> but there is a
[WITHOUT ROWID] table name <i>index_name</i>, then (as of
SQLite [version 3.30.0] on [dateof:3.30.0]) this pragma returns the
columns of the WITHOUT ROWID table as they are used
in the records of the underlying b-tree, which is to say with
de-duplicated PRIMARY KEY columns first followed by data columns.
}
Pragma index_list {
<p>^(<b>PRAGMA DB.index_list(</b><i>table-name</i><b>);</b></p>
<p>This pragma returns one row for each index associated with the
given table.)^
<p>Output columns from the index_list pragma are as follows:
|