MySQL digital function

The database used in the following , May refer to Create exercise database

Find the absolute value

1. function ：ABS(number)

2. Instructions

   SELECT ABS(10) AS  Take the absolute value , ABS(-10) AS  Take the absolute value ;
   

3. Running results

   

averaging

1. function ：AVG( Field )

2. demand ： Calculation xs_kc The middle school number is 081101 Students' average grades in all courses .

   1. Instructions

      select  Student number , Course no. ,avg( achievement ) as  Average score  from xs_kc where  Student number ="081101"
      

   2. Running results

      

Sum up

1. function ：SUM()

2. demand ： Calculation xs_kc The grades of all students in the table and .

   1. Instructions

      select sum( achievement ) as  Total score  from xs_kc
      

   2. Running results

      

Exponentiation

1. function ：POW(x,y)

2. explain ： return x Of y Power

3. Instructions

   SELECT POW(2,3),POW(3,2);
   

4. Running results

   

Seeking remainder

1. function ：MOD(x,y)

2. explain ： The return value is x Divide y The remainder of .

3. Instructions

   SELECT MOD(10,3),MOD(10,5);
   

4. Running results

   

to be divisible by

1. grammar ：x DIV y

2. explain ： return x Divide y The integer part of the result , No rounding .

3. Instructions

   SELECT 10 DIV 3,5 DIV 2;
   

4. Running results

   

Rounding up

1. function ：CEIL()

2. explain ： This function will return a minimum integer greater than or equal to this number .

3. Instructions

   select CEIL(1.5);
   

4. Running results

   

Rounding down

1. function ：FLOOR()

2. explain ： This function will return a minimum integer less than or equal to this number .

3. Instructions

   select FLOOR(1.5);
   

4. Running results

   

Round to the nearest whole

1. function ：ROUND()

2. Instructions

   SELECT ROUND(1.23),ROUND(1.57);
   

3. Running results

   

After decimal point n position

1. function ：TRUNCATE(x,y)

2. explain ：x Is the decimal to be processed ,y It's the number of reserved digits , No rounding occurs .

3. Instructions

   SELECT TRUNCATE(3.1415926,2),TRUNCATE(3.1415926,4);
   

4. Running results

   

Return the maximum value in the field

1. function ：MAX()

2. demand ： find xs_kc The record with the highest score in the table .

   1. demand

      select  Student number , Course no. ,max( achievement ) as  Maximum score  from xs_kc;
      

   2. Running results

      

Return the minimum value in the field

1. function ：MIN()

2. demand ： find xs_kc The record with the lowest score in the table .

   1. Instructions

      select  Student number , Course no. ,min( achievement ) as  Maximum score  from xs_kc;
      

   2. Running results

      

Angle in radians

1. function ：RADIANS()

2. Instructions

   SELECT RADIANS(60),RADIANS(90);
   

3. Running results

   

The angle of arc

1. function ：DEGREES()

2. Instructions

   SELECT DEGREES(1.0471975511965976),DEGREES(1.5707963267948966);
   

3. Running results