I am using MySQL 5.1. As a rookie, here are some basic command commands I feel useful to rememberknow.
Some basic mysql commands
Use mysql client to access the database.
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% $ myslq -u database-user -p |
Show databases
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SELECT m.name, avg(m.medians) medians from (
SELECT x.name, x.val medians
FROM A x, A y
WHERE x.name=y.name
GROUP BY x.name, x.val
HAVING SUM(y.val <= x.val) >= COUNT(*)/2
AND SUM(y.val >= x.val) >= COUNT(*)/2
)AS m group by m.name;
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Save SQL results in a csv file,
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SELECT ...
FROM ...
INTO OUTFILE '/tmp/sqlresults.csv'
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '"'
ESCAPED BY '\\'
LINES TERMINATED BY '\n';
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