Update trigger in oracle on updating a column

Posted by / 23-Aug-2018 22:46

Note Frequency is information about the occurrence of each distinct value in the first key column of the statistics object, and is calculated as row count * density.

A maximum frequency of 1 can be found in columns with unique values.

It appears to be the most recently inserted autoincrement value. To work around this, use the workaround from 5.1 and earlier: id=LAST_INSERT_ID(id) in the updating query.

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Each histogram step includes a range of column values followed by an upper bound column value.

Filtered statistics use a filter predicate to select the subset of data that is included in the statistics.

For most queries, the Query Optimizer already generates the necessary statistics for a high quality query plan; in some cases, you need to create additional statistics or modify the query design for best results.

This topic discusses statistics concepts and provides guidelines for using query optimization statistics effectively.

For example, depending on your predicates, the Query Optimizer could use cardinality estimates to choose the index seek operator instead of the more resource-intensive index scan operator, and in doing so improve query performance.

Each statistics object is created on a list of one or more table columns and includes a displaying the distribution of values in the first column.

update trigger in oracle on updating a column-79update trigger in oracle on updating a column-76update trigger in oracle on updating a column-42

An PDF (US Ltr) - 44.1Mb PDF (A4) - 44.2Mb PDF (RPM) - 39.6Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.2Mb HTML Download (RPM) - 8.8Mb Man Pages (TGZ) - 203.1Kb Man Pages (Zip) - 310.3Kb Info (Gzip) - 3.9Mb Info (Zip) - 3.9Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide Security in My SQL Starting and Stopping My SQL My SQL and Linux/Unix My SQL and Windows My SQL and OS X Building My SQL from Source My SQL Restrictions and Limitations My SQL Partitioning My SQL Secure Deployment Guide My SQL Tutorial My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository This won't work: INSERT INTO xxx(id,val) SELECT a,b FROM yyyy ON DUPLICATE KEY UPDATE val = VALUES(val)Taking value that will be inserted with VALUES() only works with INSERT INTO .... Here is a nice tip for INSERT INTO SELECT ON DUPLICATE KEY UPDATE.

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