Updating long data type
If the table goes to disk as My ISAM instead of being a MEMORY Table, Created_tmp_disk_tables is also incremented by one, as seen here. The test table I used is using the My SQL world database andmysql alter table kris add primary key (id); The test query shown above is 'using temporary' because I group by one column and order by another, forcing My SQL to use a temporary table.Had I been using the same query on the original City table from the world database, a tmp table would have been needed as well, but it would have been created as a MEMORY table as the original name column is a CHAR(35).
In some cases, it may be desirable to store binary data such as media files in columns.
Probably this is old had to professional programmers, but my book's limited discussion of BLOB data was about the data type, not how to use it.
Newbies, to make your life easier, here's a quick how-to insert/return blob data at the command line:****1) Got errors about NULL value in NOT NULL column.
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For truncation of nonspace characters, you can cause an error to occur (rather than a warning) and suppress insertion of the value by using strict SQL mode. Truncation of excess trailing spaces from values to be inserted into column is indexed, index entry comparisons are space-padded at the end.