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My SQL prefers MEMORY, but there are situations where it is forced to go to disk.2.
You must have a query which includes any TEXT or BLOB type in the column list, that is in the part of the query between SELECT and FROM.
: DMeanwhile, I tried moving the photo to a new directory to solve my so-called "permissions" problem, but that wasn't the problem.
Truly, I was getting Error 1048 was because I needed to use forward slashes!
On the Arduino Uno (and other ATmega based boards) an int stores a 16-bit (2-byte) value.
This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) - 1).
(You will get Error 1048 if you try to insert a NULL value, or when using LOAD_FILE and it can't read it for any reason..always permissions.)2) After solving #1, SELECT statement seemed to confirm the picture is indeed stored in the table.
However, this returned so many unreadable characters that I could not scroll back to see the complete results, and I had to wait a couple minutes until my computer stopped beeping.
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).SOLUTION: In addition to proper permissions, I need to use "/", not "\" in path to blob data (which was a picture).Note, this worked properly even for a non-relative path starting at the drive letter!(Lucky for me, the system didn't crash.)SOLUTION: use the SUBSTRING() function in the SELECT statement to only return so many characters from that blob field!** SAMPLE DATA IF YOU WANT TO TRY YOURSELF **** Edited, forgot to use double-backslashes in "Filename" column.