Updating mysql table

Each morning I imprt a new spreadsheet with the days racing selections without the odds and result field filled in.

As the day goes on I use a page to update the results but when I update a race with horse that has run in the past it updates the new record and the old record as well.

The renaming of a column can be achieved using the CHANGE keyword together with the old and new column names followed by the current datatype of the column.

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For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.The implicit default value is tables for which there are foreign key constraints, the My SQL optimizer might process tables in an order that differs from that of their parent/child relationship. Instead, update a single table and rely on the provides to cause the other tables to be modified accordingly. COLUMN2 IS NULLAn outerjoin is performed based on the equijoin condition.My SQL is by far the most popular database management system for small- to medium-sized web projects.This option takes a list of one or more partitions or subpartitions (or both).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.

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