Wall space perhaps not as part of the number are ignored
Partitioned Desk Service
Remove supports direct partition choices with the PARTITION clause, which takes a summary of the comma-es of just one or higher wall space otherwise subpartitions (otherwise each other) where to select rows is decrease. Offered good partitioned dining table t having an effective partition called p0 , doing the newest report Delete Off t PARTITION (p0) contains the same influence on new desk as the carrying out Transform Desk t TRUNCATE PARTITION (p0) ; in the two cases, all of the rows during the partition p0 is actually decrease.
PARTITION can be used along with a WHERE condition, in which case the condition is tested only on rows in the listed partitions. For example, DELETE FROM t PARTITION (p0) WHERE c < 5 deletes rows only from partition p0 for which the condition c < 5 is true; rows in any other partitions are not checked and thus not affected by the DELETE .
The PARTITION condition can also be used into the multiple-table Remove comments. You can use as much as one such option for each desk named regarding From choice.
Auto-Increment Articles
For many who delete this https://datingranking.net/cs/dine-app-recenze/ new line which has the maximum worth to own a keen AUTO_INCREMENT line, the value isn’t reused having a MyISAM otherwise InnoDB desk. For individuals who erase most of the rows in the dining table with Delete Away from tbl_label (instead a where term) into the autocommit mode, the latest series initiate more for everyone shops motors except InnoDB and you may MyISAM . There are some conditions compared to that behavior to possess InnoDB tables, once the discussed for the Area 14.6.1.six, “AUTO_INCREMENT Dealing with into the InnoDB”.
To possess MyISAM tables, you can identify a car or truck_INCREMENT secondary column for the a multiple-line secret. In this instance, reuse out of opinions erased in the the upper sequence occurs for even MyISAM dining tables. (more…)