Increase in the number of SQL

I want a query that increments a count by one after each number of documents...
example,
After that 3 rows, it increases a 1 meter
Counter value
1A
2A
1 c
d 2
2 e
$0
3 d
3 rd
3 f

NTILE (3) separate all lines into three size groups equal (as close as possible) while the OP asked to divide all the lines in groups where each group has 3 rows. Everything you need for this is ROWNUM. See the difference:

SQL> select ename,NTILE(3) OVER(ORDER BY ename) from emp;

ENAME      NTILE(3)OVER(ORDERBYENAME)
---------- --------------------------
ADAMS                               1
ALLEN                               1
BLAKE                               1
CLARK                               1
FORD                                1
JAMES                               2
JONES                               2
KING                                2
MARTIN                              2
MILLER                              2
SCOTT                               3

ENAME      NTILE(3)OVER(ORDERBYENAME)
---------- --------------------------
SMITH                               3
TURNER                              3
WARD                                3

14 rows selected.

SQL> select ename,ceil(rownum / 3) from emp;

ENAME      CEIL(ROWNUM/3)
---------- --------------
MILLER                  1
CLARK                   1
KING                    1
ADAMS                   2
SMITH                   2
JONES                   2
FORD                    3
SCOTT                   3
JAMES                   3
MARTIN                  4
WARD                    4

ENAME      CEIL(ROWNUM/3)
---------- --------------
ALLEN                   4
BLAKE                   5
TURNER                  5

14 rows selected.

SQL> 

SY.

Tags: Database

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