Fungsi matematika

Fungsi untuk Memanipulasi Data di SQL Server

Ana Voicu

Data Engineer

ABS(numeric_expression)

Mengembalikan nilai absolut dari suatu ekspresi.
Nilai tidak negatif dari ekspresi tersebut.

SELECT 
    ABS(-50.4 *3) AS negative,
    ABS(0.0) AS zero,
    ABS(73.2 + 15 + 8.4) AS positive;

| negative | zero | positive |
|----------|------|----------|
| 151.2    | 0    | 96.6     |

SIGN(numeric_expression)

Mengembalikan tanda dari suatu ekspresi, sebagai bilangan bulat:
- -1 (bilangan negatif)
- 0
- +1 (bilangan positif)

SELECT 
    SIGN(-50.4 *3) AS negative,
    SIGN(0.0) AS zero,
    SIGN(73.2 + 15 + 8.4) AS positive;

| negative | zero | positive |
|----------|------|----------|
| -1.0     | 0    | 1.0      |

Fungsi pembulatan

CEILING(numeric_expression)
- Mengembalikan bilangan bulat terkecil yang ≥ ekspresi.
FLOOR(numeric_expression)
- Mengembalikan bilangan bulat terbesar yang ≤ ekspresi.
ROUND(numeric_expression, length)
- Mengembalikan nilai numerik yang dibulatkan ke panjang tertentu.

Contoh fungsi pembulatan

SELECT 
    CEILING(-50.49) AS ceiling_neg,
    CEILING(73.71) AS ceiling_pos;

| ceiling_neg | ceiling_pos | 
|-------------|-------------|
| -50         | 74          |

Contoh fungsi pembulatan

SELECT 
    CEILING(-50.49) AS ceiling_neg,    
    FLOOR(-50.49) AS floor_neg,
    CEILING(73.71) AS ceiling_pos,
    FLOOR(73.71) AS floor_pos;

| ceiling_neg | floor_neg | ceiling_pos | floor_pos | 
|-------------|-----------|-------------|-----------|
| -50         | -51       | 74          | 73        |

Contoh fungsi pembulatan

SELECT 
    CEILING(-50.49) AS ceiling_neg,    
    FLOOR(-50.49) AS floor_neg,
    CEILING(73.71) AS ceiling_pos,
    FLOOR(73.71) AS floor_pos,
    ROUND(-50.493, 1)AS round_neg,
    ROUND(73.715, 2) AS round_pos;

| ceiling_neg | floor_neg | ceiling_pos | floor_pos | round_neg | round_pos |
|-------------|-----------|-------------|-----------|-----------|-----------|
| -50         | -51       | 74          | 73        | -50.500   | 73.720    |

Fungsi eksponensial

POWER(numeric_expression, power)
- Mengembalikan nilai pangkat dari ekspresi.
SQUARE(numeric_expression)
- Mengembalikan kuadrat dari ekspresi.
SQRT(numeric_expression)
- Mengembalikan akar kuadrat dari ekspresi.
Perhatikan: tipe ekspresi adalah float atau dapat dikonversi implisit ke float.

Contoh POWER()

SELECT   
POWER(2, 10)  AS pos_num,
POWER(-2, 10) AS neg_num_even_pow,
POWER(-2, 11) AS neg_num_odd_power,
POWER(2.5, 2) AS float_num,
POWER(2, 2.72) AS float_pow;

| pos_num | neg_num_even_pow | neg_num_odd_pow | float_num | float_pow |
|---------|------------------|-----------------|-----------|-----------|
| 1024    | 1024             | -2048           | 6.3       | 6         |

Contoh SQUARE()

SELECT   
SQUARE(2)  AS pos_num,
SQUARE(-2) AS neg_num,
SQUARE(2.5) AS float_num;

| pos_num | neg_num | float_num |
|---------|---------|-----------|
| 4       | 4       | 6.25      |

Contoh SQRT()

SELECT   
SQRT(2)  AS int_num,
SQRT(2.76) AS float_num;

| int_num         | float_num        |
|-----------------|------------------|
| 1.4142135623731 | 1.66132477258361 |

Ayo berlatih!

Fungsi untuk Memanipulasi Data di SQL Server