Getting Counts with single query

Question

HI,
I need help in writing a query that gets account counts in a single query,
CREATE TABLE ACCOUNTINFO(     
ACCOUNTID VARCHAR2(20 BYTE) NOT NULL,
ACCOUNTNO VARCHAR2(10 BYTE) NOT NULL,
LAST_DEPOSIT_DATE DATE,
BALANCE NUMBER(10,0));
I have a table like above and I am trying to write a query that gets
Count of accounts with deposits made in last 1 month,
Count of accounts with deposits made in last 2 months
Account Count with balance > 0,
Also, I need to join this ACCOUNTINFO with ACCOUNTMAIN to get name etc details
CREATE TABLE ACCOUNTINFO(     
EMPID VARCHAR2(20 BYTE) NOT NULL,
FNAME VARCHAR2(30 BYTE) NOT NULL,
MNAME VARCHAR2(30 BYTE),
LNAME VARCHAR2(30 BYTE) NOT NULL,
DOB DATE,
ACCOUNTID VARCHAR2(20 BYTE));
Question, how to write a query since I getting too-many counts (I have only 3 in sample above, actual goes on like 3-6, 6-9 etc).

Answer 1

SELECT SUM  (CASE WHEN LAST_DEPOSIT>=ADD_MONTHS(SYSDATE,-1) THEN
               1
             ELSE
               0
             END
            ) COUNT_LAST_MONTH,
       SUM  (CASE WHEN LAST_DEPOSIT>=ADD_MONTHS(SYSDATE,-2) THEN
               1
             ELSE
               0
             END
            ) COUNT_LAST_TWO_MONTHS,
       SUM  (CASE WHEN BALANCE>0 THEN
               1
             ELSE
               0
             END
            ) COUNT_BALANCE_GREATER_ZERO
  FROM ACCOUNTINFO