I am trying to do an upsert on the array column but I am not able to achieve the following result. Table name settings id primary key unique user_id foreign_key integer unique friends array tags …
Tag: postgresql
How to grant permissions in Postgres on tables that start with parcel?
Answer GRANT takes only fixed table names (or list of tables). What you want require dynamic SQL, ie dynamically building a statement and executing it in an anonymous block. Consider:
postgresql ERROR: syntax error at or near “PRIMARY”
I’m new to PostgreSQL. I’ve been trying to create tables in a database but some queries give weird errors. the first snippet throws a syntax error but when I add “serial” on the problematic column the error is resolved. Should all primary keys auto-increment in PostgreSQL? This works a…
Use COPY to read a csv into database, while adding constant columns
I have a series of CSV files, in the format: “Alice”,”Bob”,”A”,123.46,”4″ “Charlie”,”Dana”,”B”,987.6543,”9″ … I want to produce a table like this: id file_id mch c1 c2 c3 c4 …
Query to find value in column dependent on a different column in table being the minimum date
I have a dataset that looks like this. I would like to pull a distinct id, the minimum date and value on the minimum date. This code will pull the id and the minimum date How can I get the value on the minimum date so the output of my query looks like this? Answer Use distinct on: This can
posgresql exclude zero division error results
I am executing a query but for sum cases this part of the code results into zero which causes zero division error.I am trying to not show result(not select) when Pease help. Answer The simplest way is to remove the else 0: This returns NULL if nothing matches the condition. Dividing by NULL produces NULL and …
SQL query for pagination with multiple columns; understand OR operator
I’m using a tool that generates the Postgresql query below: I need to understand why the OR operator? My players table can have many rows with the same score but not the same id. Is that OR needed when multiple rows has the same score value? Answer The purpose of the OR — as you suspect — is…
Tableau calculated field : i’m trying to create calculated field in tableau
i’m trying to create calculated field in tableau, my query is below: i’m getting error saying cannot mix agreegate and non agreegate comparison. Final objective is to divide with revenue column . Please help Answer It appears that your numerator is a sum (an aggregation) but your denominator is no…
Recreating relation between two tables
I have a 1:1 relation between data that was not an explicit foreign key in the database. E.g. Table 1 has a once, b twice and c once Table 2 also has a once, b twice and c once I want to create a foreign key from Table 1 to Table 2 when the value is the same: Expected Table
PostgreSQL alter column type from DATERANGE to TSTZRANGE and migrate the data
We’re changing a column run_dates (per request) from daterange to tstzrange, a column with a few months of test data. Essentially we want to migrate! I’m running the script below, inspired by postgreSQL alter column data type to timestamp without time zone and I have to admit, my SQL background is…