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Table of Contents

Useful SQL Commands

  • alter user MYUSER account unlock - unlock an account
  • inline view query
SELECT * 
  FROM ( SELECT deptno, count(*) emp_count
         FROM emp
         GROUP BY deptno ) emp,
       dept
 WHERE dept.deptno = emp.deptno;
TO_DATE('2003/07/09', 'yyyy/mm/dd')
  • between dates
create_datetime between TO_DATE('2016/07/25 09:00', 'yyyy/mm/dd HH24:MI') and TO_DATE('2016/07/25 10:50', 'yyyy/mm/dd HH24:MI') 

Joins

Outer join to select everything from table1 but only matches from table2, otherwise

SELECT columns
FROM table1
LEFT [OUTER] JOIN table2
ON table1.column = table2.column;

Common Table Expression

String parsing in SQL

Oracle specific

  • plsql check to see if a column exists before adding
select count(*) into vRowCount
	from DBA_TAB_COLUMNS
    	where OWNER = '{owner}'
	and TABLE_NAME = '{table}'
	and COLUMN_NAME = '{column}' ;

-- Create the new column
IF vRowCount <= 0 THEN
  • tnsping mysid -- check that a SID exists in your configured tnsnames.ora
  • kill a session -- todo: fill this out
select username, user#, sid, serial#, inst_id from gv$session where machine =
 
SQL> ALTER SYSTEM KILL SESSION 'sid,serial#' IMMEDIATE;
select OS_USERNAME, USERNAME , USERHOST, RETURNCODE, TIMESTAMP
from dba_audit_session
where to_date(TIMESTAMP, 'DD-Mon-YY') in (select to_date(TIMESTAMP, 'DD-Mon-YY')
from dba_audit_session
where to_date(TIMESTAMP,'DD-Mon-YY') = to_date(sysdate, 'DD-Mon-YY'))
and RETURNCODE = 28000;
  • use dba_errors to find SQL issues:
select name,sequence,line,position,text
from dba_errors
where owner='{schema}'
and name='{object_name}';  -- like a package name for instance
  • change user password
ALTER USER user_name IDENTIFIED BY new_password;
SELECT *
FROM orders
WHERE order_date BETWEEN TO_DATE ('2003/01/01', 'yyyy/mm/dd')
AND TO_DATE ('2003/12/31', 'yyyy/mm/dd');
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