Oracle PL/SQL Tutorial/Numerical Math Functions/SQRT

SQRT(25)

   <source lang="sql">

SQL> select SQRT(25) from dual;

 SQRT(25)

---

        5</source>
   
  

SQRT(5)

   <source lang="sql">

SQL> select SQRT(5) from dual;

  SQRT(5)

---

2.23606798</source>

SQRT(x) gets the square root of x.

The following example displays the square root of 25 and 5, respectively:

   <source lang="sql">

SQL> SQL> SELECT SQRT(25), SQRT(5) FROM dual;

 SQRT(25)    SQRT(5)

---

----------

        5 2.23606798

SQL></source>

Use SQRT in column data

   <source lang="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 (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 (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
        5         10
        6          3
        8     123.45
        9      98.23

7 rows selected. SQL> SQL> SQL> SELECT id, value, SQRT(value) FROM myTable

 2  /
       ID      VALUE SQRT(VALUE)

---

---------- -----------

        1          9           3
        2       2.11   1.4525839
        3       3.44   1.8547237
        5         10  3.16227766
        6          3  1.73205081
        8     123.45  11.1108056
        9      98.23  9.91110488

7 rows selected. SQL> SQL> SQL> SQL> -- clean the table SQL> drop table myTable

 2  /

Table dropped. SQL></source>

Using SQRT and ABS together

   <source lang="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> --The following query handles both positive and negative numbers SQL> SQL> SQL> SELECT id, value, SQRT(ABS(value)) FROM myTable

 2  /
       ID      VALUE SQRT(ABS(VALUE))

---

---------- ----------------

        1          9                3
        2       2.11        1.4525839
        3       3.44        1.8547237
        4      -4.21       2.05182845
        5         10       3.16227766
        6          3       1.73205081
        7      -5.88       2.42487113
        8     123.45       11.1108056
        9      98.23       9.91110488

9 rows selected. SQL> SQL> -- clean the table SQL> drop table myTable

 2  /

Table dropped. SQL> SQL></source>