| SQL functionsPostgres builtin functions and operators (a sample)Mathematics
 
  
    | Function | Description | Example | Result |  
          | abs(x) | absolute value | abs(-4.19) | 4.19 |  
          | ln(x) | Natural log | ln(2.0) | 0.693147180559945 |  
          | log(x) | Base 10 logarithm | log(100.0) | 2 |  
          | pi() | You know, pi | pi() | 3.14159265358979 |  
          | sin(x) | sine | sin(radians(30.0)) | 0.5 |  
          | radians(x) | Convert degrees to radians | radians(30.0) | 0.523598775598299 |  
          | asin(x) | inverse sine | asin(0.5) | 0.523598775598299 |  |