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Mysql updating a table from another table dating someone who is bipolar side effects

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You should have indexes on tobeupdated.value and original.value EDIT: we can also simplify the query 10,000 ), so I took your and noodl's advice about the indexes and the whole query now finishes in under a second. Thanks so much for your help; I've learnt a lot!it depends what is a use of those tables , but you might consider putting trigger on original table on insert and update and when insert or update is done update second table based on only one item from original table , it will be quicker.For small numbers of rows requiring updates, it can be adequate to use an UPDATE statement for each row that requires an update.

mysql updating a table from another table-45

But it's hard to tell from what has been explicitly given in your question.For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.If you set a column to the value it currently has, My SQL notices this and does not update it.PDF (US Ltr) - 37.9Mb PDF (A4) - 38.0Mb PDF (RPM) - 37.3Mb HTML Download (TGZ) - 10.3Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 216.7Kb Man Pages (Zip) - 329.5Kb Info (Gzip) - 3.4Mb Info (Zip) - 3.4Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 option as part of a table reference.This option takes a list of one or more partitions or subpartitions (or both).(Bug #11758262, Bug #50439) See Section 16.2.1.3, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.