Hello,
I am importing CSV data from a proprietary database into a table in MySQL. Due
to a flaw in the proprietary software's export tool, currency values (floats)
are always exported with a '$' prefixed to them. This causes a problem where
the matching float field in the MySQL table being set to zero (or not set at
all) after import.
As a solution to getting a complete import, I modified the data type of the
field in MySQL from float to varchar(8), so now the data is present in the
table.
I am faced with the problem of removing the '$' from the string.
I can filter out the '$' by doing a string manipulation,
SELECT MID((SELECT `imported_data`.`PartPrice` FROM `imported_data` WHERE
`imported_data`.`PartNumber`='1') FROM 2);
I can change the value of a record from $100 to 100 by hand.
UPDATE `imported_data` SET `imported_data`.`PartPrice`='100' WHERE
`imported_data`.`ParttNumber`='49152';
And thus tried,
UPDATE `imported_data` SET `imported_data`.`PartPrice`=(SELECT MID((SELECT
`imported_data`.`PartPrice` FROM `imported_data` WHERE
`imported_data`.`PartNumber`='49152') FROM 2);) WHERE
`imported_data`.`PartNumber`='49152';
It was a nice try, but found out from MySQL that "You can't specify target
table 'imported_data' for update in FROM clause" and discovered that it really
looks like that I cannot write data to a table while a nested query is reading
the same location.
I could create a new field and insert into that instead of updating.
But, regardless of the approach, I would still have to execute this statement
some 8,000 times. Once for each part number I have. Putting something like
this in a for-loop almost feels like I am avoiding a feature of convenience
that I am not aware of.
There really must be an easier way. Can anybody help me with a more elegant
solution? (BTW, I have been explicitly forbidden from doing a search and
replace on '$' with the CSV file that got exported)
Thank you for assisting me and your support of a fine database software package!
Timothy Legg
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