SQL Commands
PostgreSQL
| 🎯 Purpose | ⌨️ Command |
|---|---|
| Connection test (interactive) |
psql postgres://user@localhost:5432/dbname?sslmode=require -c 'SELECT 1'
|
| Connection test (automatic) |
PGPASSWORD='1234' psql postgres://user@localhost:5432/dbname?sslmode=require -c 'SELECT 1'
|
| Connection test (container) |
psql postgres://user@localhost:5432/dbname?sslmode=require -c 'SELECT 1'
|
Common Operations
Functions
| Postgres | MariaDB | SQLite | |
|---|---|---|---|
| Today |
Visiting
| Postgres | MariaDB | SQLite | |
|---|---|---|---|
| List tables | show tables; |
.tables |
CREATE USER
| Postgres | MariaDB | |
|---|---|---|
| create user | CREATE USER username WITH PASSWORD 'your_password';
|
|
| change password |
GRANT
| Postgres | MariaDB | |
|---|---|---|
| on database to user | GRANT ALL PRIVILEGES
ON DATABASE operation_center
TO db_user;
|
|
| on table to user | GRANT ALL PRIVILEGES
ON ALL TABLES
IN SCHEMA public
TO db_user;
|
SQLite 3
| TODO | Command |
|---|---|
| yyyymmdd to yyyy-mm-dd |
SELECT printf('%s-%s-%s',
SUBSTR(trading_date,1,4),
SUBSTR(trading_date,5,2),
SUBSTR(trading_date,7,2)
) FROM short_sell WHERE trading_date='20190605';
|