Exporting a MySQL table into a CSV file

Question

I have a MySQL table which has to be taken out as a CSV file. The query I used is

SELECT "ID","NAME","SALARY","SAL1","SAL2","SAL3","SAL4","SAL5","SAL6","SAL7","SAL8","SAL9","SAL10","SAL11","SAL12","SAL13","SAL14","SAL15","SAL16","SAL17","SAL18","SAL19","SAL20","SAL21","SAL22","SAL23","SAL24","SAL25","SAL26"
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';

This query works, but what if I have 200 column names? Is there a way to do it without manually typing it?

Answer 1

This command almost gives you what you want, and it even works with a remote server. The only caveat is that it generates a TSV file (fields are separated by a tab).

mysql mydb -e "select * from mytable" -B > mytable.tsv 

But you could convert it to CSV using sed, as suggested in this answer :

mysql mydb -e "select * from mytable" -B | sed "s/'/\'/;s/\t/\",\"/g;s/^/\"/;s/$/\"/;s/\n//g" > mytable.csv

Answer 2

DESCRIBE addstock25;

Strip the first column and the first three entries of that column (it depends on your usage). You will get the list of fields in addstock25.

This will bring only field names using virtual tables derived in core... called information schema.

SELECT `COLUMN_NAME` 
FROM `INFORMATION_SCHEMA`.`COLUMNS` 
WHERE `TABLE_NAME`='foo';

Let's say the name of this query would be sq_fieldnamelist.

So, the above table has one column and it has the field names of the "foo" table.

If directly writing like

SELECT (sq_fieldnamelist)
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n

MySQL will give an error. "subquery returns multiple rows"

We must edit sq_fieldnamelist to concatenate all entries back to back, separated with commas.

Select GROUP_CONCAT(COLUMN_NAME)
FROM
(SELECT `COLUMN_NAME` 
FROM `INFORMATION_SCHEMA`.`COLUMNS` 
WHERE `TABLE_NAME`='ffd_companies'
LIMIT 3,100
) AS fafa
GROUP BY 'COLUMN_NAME' // This group by is just to make group concatenation work

Let's say this is sq_fieldnamelist2.

If we edit sq_fieldnamelist like this, it will return only one value which is all field names separated with commas. So now we can put this subquery in your select statement to acquire the needed fields.

SELECT (sq_fieldnamelist2)
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n

You need to edit LIMIT 3,100 in sq_fieldnamelist2 for you own purpose.

Let's say your table is like fil1, fil2...filN, sal1, sal2, sal3...., salI. To see the only salary fields, you should use LIMIT N, x > I+N . If you want to see all, use LIMIT 0, x > N+I .

Answer 3

I'm not seeing why you can't do

SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'

Answer 4

I think you are looking for something like this.

SET @sql = NULL;
SELECT GROUP_CONCAT("'",COLUMN_NAME,"'")
 FROM
(SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA` = 'yourdatabasename'
and `TABLE_NAME`='ffd_companies'
) AS colnames
GROUP BY 'COLUMN_NAME'
into @sql;

SET @sql = concat ("SELECT", @sql, " from dual
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE 'E:\\JOSE DATA\\addstock7.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '", '"',"'
)"
);

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Note that I added the WHERE clause TABLE_SCHEMA = 'yourdatabasename'.

Answer 5

I have integrated the script for simple UI based code. Here you can enter query and simply can get the csv file containing all rows including column names.

This script works for both windows and linux systems.

https://github.com/Bihari12/databasetocsv

This would save the result in csv file in the same folder in which the code exists.

Answer 6

可以使用“表数据导出向导”，从那里可以复制选择的 SQL；