Use SIGN function to deal with column data : SIGN « Numerical Math Functions « Oracle PL/SQL Tutorial






SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table myTable(
  2    id           NUMBER(2),
  3    value        NUMBER(6,2)
  4  )
  5  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into myTable(ID,  value)values (1,9)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (2,2.11)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (3,3.44)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (4,-4.21)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (5,10)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (6,3)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (7,-5.88)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (8,123.45)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (9,98.23)
  2  /

1 row created.

SQL>
SQL> select * from myTable
  2  /

        ID      VALUE
---------- ----------
         1          9
         2       2.11
         3       3.44
         4      -4.21
         5         10
         6          3
         7      -5.88
         8     123.45
         9      98.23

9 rows selected.

SQL>
SQL> SELECT id, value, SIGN(value) FROM myTable
  2  /

        ID      VALUE SIGN(VALUE)
---------- ---------- -----------
         1          9           1
         2       2.11           1
         3       3.44           1
         4      -4.21          -1
         5         10           1
         6          3           1
         7      -5.88          -1
         8     123.45           1
         9      98.23           1

9 rows selected.

SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table myTable
  2  /

Table dropped.

SQL>
SQL>








14.18.SIGN
14.18.1.SIGN(x) gets the sign of x. SIGN() returns -1 if x is negative, 1 if x is positive, or 0 if x is zero.
14.18.2.Use SIGN function to deal with column data
14.18.3.SIGN(-5)
14.18.4.SIGN(5) (2)
14.18.5.SIGN(0)