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Overview
Comment: | More documentation on how PRAGMA index_info and PRAGMA index_xinfo handle indexes on expressions. |
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d9d337b9270d984f8f46cb8ac403975c |
User & Date: | drh 2019-09-26 19:24:07.687 |
Context
2019-09-26
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19:34 | Update the RBU documentation to remove the constraint about it not working with indexes on expressions. (check-in: e7771db6cc user: drh tags: trunk) | |
19:24 | More documentation on how PRAGMA index_info and PRAGMA index_xinfo handle indexes on expressions. (check-in: d9d337b927 user: drh tags: trunk) | |
19:02 | Fix introspection pragma documentation to show that they are now on by default. Add documentation for the TCL Interface config method. (check-in: a94ea31acb user: drh tags: trunk) | |
Changes
Changes to pages/pragma.in.
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1471 1472 1473 1474 1475 1476 1477 | index-columns are not shown by the index_info pragma, but they are listed by the [index_xinfo pragma].</p> <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. | > > | > | 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 | index-columns are not shown by the index_info pragma, but they are listed by the [index_xinfo pragma].</p> <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. ^A value of -1 means [rowid] and a value of -2 means that an [expression index|expression] is being used. <li>^The name of the column being indexed. ^This columns is NULL if the column is the [rowid] or an [expression index|expression]. </ol> <p>If there is no index named <i>index-name</i> but there is a [WITHOUT ROWID] table with that name, 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 |
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1497 1498 1499 1500 1501 1502 1503 | locate the table entry that corresponds to each index entry.) <p>Output columns from the index_xinfo pragma are as follows: <ol> <li>^(The rank of the column within the index. (0 means left-most. Key columns come before auxiliary columns.))^ <li>^The rank of the column within the table being indexed, or -1 if | | > | > | 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 | locate the table entry that corresponds to each index entry.) <p>Output columns from the index_xinfo pragma are as follows: <ol> <li>^(The rank of the column within the index. (0 means left-most. Key columns come before auxiliary columns.))^ <li>^The rank of the column within the table being indexed, or -1 if the index-column is the [rowid] of the table being indexed and -2 if the [expression index|index is on an expression]. <li>^The name of the column being indexed, or NULL if the index-column is the [rowid] of the table being indexed or an [expression index|expression]. <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> |
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