MYSQL: How dump resultset into a LONGTEXT variable rather than to a output file

I want to modify the following code:

SELECT * INTO OUTFILE 'C:\\my_excel_table.csv'
 FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
 LINES TERMINATED BY '\r\n'
 FROM m开发者_运维技巧ytable;

so that it dumps the result into longtext/variable rather than to a output file.

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Not sure if you can, but there is the INSERT ... SELECT FROM syntax, which lets you insert the results of a select into another table. Problem is that SELECT is going to return rows, which would be inserted one-by-one into the other table, instead of going in as a single long chunk of text.

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use insert select

INSERT INTO mytable (my_field) select my_other_field from my_other_table