My code:

$query="
	CREATE TABLE IF NOT EXISTS temp3 UNIQUE(CON175) 
	IGNORE SELECT DISTINCT CONCAT($tbl2.this,$tbl2.that) AS CON175 FROM
$tbl2 
	WHERE $tbl2.this='$rcc'
"; 

gives error:

Query failed: BLOB column 'CON175' used in key specification without a key
length.

Manual suggests to give a BLOB a length:
CREATE TABLE test (blob_col BLOB, INDEX(blob_col(10)));

...but how do you work this into the above query?
	CREATE TABLE IF NOT EXISTS temp3 (UNIQUE(CON175) BLOB,
INDEX(CON175)(50))...

..does not work, I suppose because CON175 has not been created yet?

CON175 is BLOB by default resulting from this part of the query: IGNORE
SELECT DISTINCT CONCAT($tbl2.this,$tbl2.that)... this and that are varchar
types.  How do I set this as varchar instead:

UNIQUE(CON175) VARCHAR(50)

does not work.

http://www.mysql.com/doc/en/CREATE_TABLE.html - lacks examples!

John























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