The following will update a field (field9 which is empty) in TABLE1 with data from a field (field9) in TABLE3 using joins with TABLE2 and TABLE3.
I have made up the WHERE & AND conditions to show this example.
I am able to update other coulmn types that are int, nvarchar.
If you update a column that has been declared , an error occurs if strict SQL mode is enabled; otherwise, the column is set to the implicit default value for the column data type and the warning count is incremented.
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 PDF (US Ltr) - 39.0Mb PDF (A4) - 39.0Mb PDF (RPM) - 38.1Mb HTML Download (TGZ) - 10.8Mb HTML Download (Zip) - 10.8Mb HTML Download (RPM) - 9.5Mb Man Pages (TGZ) - 211.1Kb Man Pages (Zip) - 320.2Kb Info (Gzip) - 3.6Mb Info (Zip) - 3.6Mb 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 My SQL Secure Deployment Guide Change values between two and more columns.
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.