Rodrigo Villablanca rvillablanca

## postgres_queries_and_commands.sql
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

## The Technical Interview Cheat Sheet.md

      
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                rvillablanca
                / The Technical Interview Cheat Sheet.md
            
            
              Created
              July 28, 2020 00:27
                — forked from tsiege/The Technical Interview Cheat Sheet.md
            
              
                This is my technical interview cheat sheet. Feel free to fork it or do whatever you want with it. PLEASE let me know if there are any errors or if anything crucial is missing. I will add more links soon.
              
          
    ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!


\

  
## JPA IdClass example
@Entity
public class Employee {
 @Id long empId;
 String empName;
 ...
}

public class DependentId {
 String name; // matches name of @Id attribute
 long emp; // matches name of @Id attribute and type of Employee PK
	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
	@Entity
	public class Employee {
	@Id long empId;
	String empName;
	...
	}

	public class DependentId {
	String name; // matches name of @Id attribute
	long emp; // matches name of @Id attribute and type of Employee PK