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More complete sync table example

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This commit is contained in:
Javier Goizueta 2019-07-01 16:58:24 +02:00
parent 9f414938ba
commit f2dae651b3
1 changed files with 16 additions and 2 deletions
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18
doc/CDB_SyncTable.md
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@ -22,14 +22,28 @@ Import some data using COPY FROM into a temporary table, then synchronize a tabl
finally delete the temporary table. This could be used import and update some data periodically while
allowing to add columns to the data that will be preserved across updates.
```sql
CREATE tmp_pois(cartodb_id int, name text, type text, longitude double precision, latitude double precision);
CREATE tmp_pois(cartodb_id int, name text, type text, longitude double precision, latitude double precision, rank int);
COPY tmp_pois FROM '/tmp/pois.csv';
SELECT CDB_SyncTable('tmp_pois', 'public', 'pois');
DROP TABLE tmp_pois;
```
Now we could perform some changes to the `pois` to maintain our own ranking:
```sql
UPDATE pois SET rank = random()*4 + 1;
```
Then, if the source were updated at `/tmp/pois.csv` we could synchronize with it while maintaining our `rank` values with:
```sql
CREATE tmp_pois(cartodb_id int, name text, type text, longitude double precision, latitude double precision, rank int);
COPY tmp_pois FROM '/tmp/pois.csv';
SELECT CDB_SyncTable('tmp_pois', 'public', 'pois', '{rank}');
DROP TABLE tmp_pois;
```
#### Arguments
```