sample=# create foreign table test (name text, id numeric) server sdb_server options (collectionspace 'sample', collection 'employee', decimal 'on'); CREATE FOREIGN TABLE sample=# \q Copy添加数据源,配置 DSN(Data Sou
$$LANGUAGEplpgsql;CREATEORREPLACEPROCEDUREsample_procedure(ININ_paramINTEGER,INOUTINOUT_paramINTEGER)LANGUAGEplpgsqlAS$$BEGININOUT_param :=IN_param+10; RAISE NOTICE'IN_param: %, INOUT_param: %', IN_param, INOUT_param;END; $$; 对象信息查询 -- 数据库selectd.datnameas"database", pg_catalog....
Sample table: employees Click me to see the solution 5.Write a query to get the first name of the employee who holds the letter 'c' and 'e' in the first name. Sample table: employees Sample table: departments Click me to see the solution 6.Write a query to display the last name, ...
Listed below is an example of the SQL generated by the PostgreSQL Rename Table function: ALTER TABLE sample.public.employee RENAME TO employee_copy Below is a screen shot of the rename table function of the PostgreSQL alter table tool.
Run the commands in this section from the PostgreSQL client shell that you opened to create mytestdb database. Create a table called “employees” in your test database: CREATE TABLE employees (employee_id int PRIMARY KEY, first_name varchar, last_name varchar); Insert a record into the ...
for a HTML sample of an Oracle database migration report. INSTALLATION All Perl modules can always be found at CPAN (http://search.cpan.org/). Just type the full name of the module (ex: DBD::Oracle) into the search input box, it will brings you the page for download. Releases of ...
postgres=# SELECT fnc_trg_delete_employee();ERROR:triggerfunctions can only be calledastriggers CONTEXT: compilationofPL/pgSQLfunction"fnc_trg_delete_employee"near line1 Therefore, you need to create the trigger that calls the trigger function when it’s activated. Let’s create ...
Sample Solution: Code: -- Calculate the total sum of salaries for all employees in the database SELECT SUM(salary) FROM employees; Explanation: This SQL query is designed to retrieve the sum of salaries for all employees stored in the database. ...
For a better understanding, we will be using the sample DVD rental database, which can be downloaded here.Example 1: Grouping Data by Customer IDHere we will query for data from the payment table and group the result by customer_id. This query will return a list of unique customer IDs....
-U <USER> -d <DBNAME> -p <PORT> ~/data.dump Be sure to replace the appropriate elements with those given in your connection settings. For now, though, let’s import a sample 200 MB employee database that contains the following: ...