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Update 'Copy data to postgresql'

Guillem Borrell Nogueras 2023-01-17 18:59:28 +01:00
parent c9ddf392a7
commit f55032bae0
1 changed files with 9 additions and 3 deletions
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12
Copy-data-to-postgresql.md

@ -1,5 +1,5 @@
```
$ head -n 100 /data/raw/data.csv | iconv -c -f ASCII -t UTF-8 | target/debug/dr csv -i | target/debug/dr schema -p -n customer_base_data
$ head -n 100 /data/raw/data.csv | iconv -c -f ASCII -t UTF-8 | dr csv -i | dr schema -p -n customer_base_data
CREATE TABLE IF NOT EXISTS "customer_base_data" ( );
ALTER TABLE "customer_base_data" ADD COLUMN "SWO_Region" varchar(128);
@ -25,13 +25,13 @@ ALTER TABLE "customer_base_data" ADD COLUMN "2022" real;
We can pipe that with
```
head -n 100 /data/raw/BCG\ Report\ 01\ Customer\ Base\ Data\ -\ 2023-01-16.csv | iconv -c -f ASCII -t UTF-8 | target/debug/dr csv -i | target/debug/dr schema -p -n customer_base_data | psql -U postgres -h localhost
head -n 100 data.csv | iconv -c -f ASCII -t UTF-8 | dr csv -i | dr schema -p -n customer_base_data | psql -U postgres -h localhost
```
Then we want to create a new file striping the header
```
tail -n +2 /data/raw/data.csv | iconv -c -f ASCII -t UTF-8 | psql -U postgres -h localhost -c "\copy customer_base_data from stdin with (FORMAT 'csv', DELIMITER ',', QUOTE '\"')"
tail -n +2 data.csv | iconv -c -f ASCII -t UTF-8 | psql -U postgres -h localhost -c "\copy customer_base_data from stdin with (FORMAT 'csv', DELIMITER ',', QUOTE '\"')"
```
To change the semicolon separator with comma:
@ -50,3 +50,9 @@ psql -U postgres -h localhost -c 'ALTER TABLE "opportunities" ALTER COLUMN "Prod
```
psql -U postgres -h localhost -c 'copy (select * from opportunities limit 10) to stdout (FORMAT 'csv', HEADER)' | dr csv -i -a
```
And even convert that output to parquet
```
psql -U postgres -h localhost -c 'copy (select * from opportunities limit 10) to stdout (FORMAT 'csv', HEADER)' | dr csv -i -P opportunities.pq
```