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Chapter 1, "Getting Started with My SQL and SQL," presented a tutorial introduction to many of My SQL's capabilities.

This chapter builds on that material to go into more detail on several areas of SQL implemented by My SQL.

My SQL Tutorials My SQL Tutorial - UPDATE Using Data from Other Tables By: (Continued from previous topic...) How To Use Values from Other Tables in UPDATE Statements?

If you want to update values in one table with values from another table, you can use a subquery as an expression in the SET clause.

Only the partitions (or subpartitions) listed are checked for matches, and a row that is not in any of these partitions or subpartitions is not updated, whether it satisfies the clause, are flagged as unsafe for statement-based replication.

(This is because the order in which the rows are updated determines which rows are ignored.) Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using mode.

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.

It also describes many of the more important SQL statements that are used for the following types of operations: My SQL's SQL statements can be grouped into several broad categories; Table 3.1 lists some representative statements for each.In some cases, a utility program is available that provides a command-line interface to a statement.For example, operations to be performed from the command line. If IGNORE is provided, all errors encountered during the update are ignored.If an update on a row would result in a violation of a primary key or unique index, the update on that row is not performed.

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For a table with 180K rows the rate of updates was about 10 rows per second.

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