postgrés
SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1, value2, ...);
Delightful Dragonfly
SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1, value2, ...); # The bash function below utilizes the CLI tool psql to vacuum analyze tables
# in a single schema which can be identified by either passing the name of
# the schema as the first parameter to the function
# or setting the environment variable PG_SCHEMA:
#
vacuum_analyze_schema() {
# vacuum analyze only the tables in the specified schema
# postgres info can be supplied by either passing it as parameters to this
# function, setting environment variables or a combination of the two
local pg_schema="${1:-${PG_SCHEMA}}"
local pg_db="${2:-${PG_DB}}"
local pg_user="${3:-${PG_USER}}"
local pg_host="${4:-${PG_HOST}}"
echo "Vacuuming schema \`${pg_schema}\`:"
# extract schema table names from psql output and put them in a bash array
local psql_tbls="\dt ${pg_schema}.*"
local sed_str="s/${pg_schema}\s+\|\s+(\w+)\s+\|.*/\1/p"
local table_names=$( echo "${psql_tbls}" | psql -d "${pg_db}" -U "${pg_user}" -h "${pg_host}" | sed -nr "${sed_str}" )
local tables_array=( $( echo "${table_names}" | tr '\n' ' ' ) )
# loop through the table names creating and executing a vacuum
# command for each one
for t in "${tables_array[@]}"; do
echo "doing table \`${t}\`..."
psql -d "${pg_db}" -U "${pg_user}" -h "${pg_host}" \
-c "VACUUM (ANALYZE) ${pg_schema}.${t};"
done
}sudo mkdir -p /etc/paths.d &&
echo /Applications/Postgres.app/Contents/Versions/latest/bin | sudo tee /etc/paths.d/postgresappIn PostgreSQL the system determines which table is meant by following a search path, which is a list of schemas to look in.
The first matching table in the search path is taken to be the one wanted, otherwise, if there is no match a error is raised, even if matching table names exist in other schemas in the database.
To show the current search path you can use the following command:
SHOW search_path;
And to put the new schema in the path, you could use:
SET search_path TO myschema;
Or if you want multiple schemas:
SET search_path TO myschema, public;
Reference: https://www.postgresql.org/docs/current/static/ddl-schemas.html# Use postgres/example user/password credentials
version: '3.1'
services:
db:
image: postgres
restart: always
environment:
POSTGRES_PASSWORD: example
adminer:
image: adminer
restart: always
ports:
- 8080:8080CREATE OR REPLACE FUNCTION foo()
RETURNS void AS $$
BEGIN
RAISE NOTICE 'Hello from void function';
END;
$$ LANGUAGE plpgsql;
-- direct call from SQL
SELECT foo();
-- in PLpgSQL
DO $$
BEGIN
SELECT foo(); -- is not allowed
PERFORM foo(); -- is ok
END;
$$;