SQL_INSTR_POSITION2
ORACLE

SELECT ENAME, position('A' in ename)"#A" , position('E' in ename)"#E" from emp

SELECT ENAME, INSTR(ENAME,'A')"#A" , INSTR(ename,'E')"#E" from emp

POSTGRESQL

SELECT ENAME, position('A' in ename)"#A" , position('E' in ename)"#E" from emp

row : 2 
 
ORACLE: Note the position /INSTR  of "A" or "E" in ename object of emp table.

PostgreSQL

MYSQL