How do I find and replace in a CSV I'm importing using mysql - mysql

Question

I'm importing a CSV file into Heidi SQL. I've created the table using this code:
create table all_data
(
Keyword varchar(1000),
Position int,
Previous_Position int,
Search_Volume int,
KW_Difficulty float,
URL varchar(1000),
Post_title varchar(1000),
Post_URL varchar(1000),
Genre varchar(1000),
Location varchar(1000),
Avg_Daily_Visitors float,
pageviews int
)
;
but in the Avg_Daily_visitors column it has "\N" where there is no value. I've been importing the data with this code:
load data local infile 'C:/filepath.../All_Data.csv'
replace into table all_data
fields terminated by ','
enclosed by '"'
escaped by '"'
lines terminated by "\r\n"
ignore 1 rows
set
Avg_Daily_Visitors = replace(Avg_Daily_Visitors,"\N",0),
pageviews = replace(pageviews,"\N", 0)
;
but it's not replacing the values with 0, which is what I want to achieve. How do I make Heidi SQL replace "\N" with "0" on import?
Thanks.

Answer 1

First assign the value you read to a variable, then work on that variable. For this you specify the columns of your destination table, but a variable instead of the column where you want to replace.
load data local infile 'C:/filepath.../All_Data.csv'
replace into table all_data
fields terminated by ','
enclosed by '"'
escaped by '"'
lines terminated by "\r\n"
ignore 1 rows
(column_1, column_2, #variable1, #variable2, column_5)
set
Avg_Daily_Visitors = replace(#variable1,"\N",0),
pageviews = replace(#variable2,"\N", 0)
;