MySQL how to convert decimal value to degree, minute, second

Question

I have a decimal value say 123.77

Now i want to convert it into corresponding degree, minute, second value using MySQ

Answer 1

The answer given by John Woo, while correct for positive values, will not give the correct results for negative values. I have adjusted his answer to take account of this.

SET @deci = -123.77;
SELECT SIGN(@deci)* FLOOR(ABS(@deci)) Degrees,
FLOOR((ABS(@deci) - (FLOOR(ABS(@deci)))) * 60) Minutes,
((ABS(@deci) - (FLOOR(ABS(@deci)))) * 60 -
FLOOR((ABS(@deci) - (FLOOR(ABS(@deci)))) * 60)) * 60 SECONDS

Answer 2

Here's how,

• The whole units of degrees will remain the same (i.e. in 121.135° longitude, start with 121°).
• Multiply the decimal by 60 (i.e. .135 * 60 = 8.1).
• The whole number becomes the minutes (8').
• Take the remaining decimal and multiply by 60. (i.e. .1 * 60 = 6).
• The resulting number becomes the seconds (6"). Seconds can remain as a decimal.
• Take your three sets of numbers and put them together, using the symbols for degrees (°), minutes (‘), and seconds (") (i.e. 121°8'6" longitude)

Query,

SET @deci = 123.77;
SELECT FLOOR(@deci) Degrees,

       FLOOR((@deci - (FLOOR(@deci))) * 60) Minutes,

       ((@deci - (FLOOR(@deci))) * 60 -
       FLOOR((@deci - (FLOOR(@deci))) * 60)) * 60 SECONDS

SQLFIDDLE DEMO

Online Conversion Tool (for checking)

Answer 3

Thinking out of the box, by borrowing a different Babylonian-based metric:

mysql> SELECT TIME_FORMAT("%H°%i'%s", SEC_TO_TIME(ROUND(3600 * -1.234)));
+-------------------------------------------------------------+
| TIME_FORMAT("%H°%i'%s", SEC_TO_TIME(ROUND(3600 * -1.234)))  |
+-------------------------------------------------------------+
| -01:14:02                                                   |
+-------------------------------------------------------------+
mysql> SELECT TIME_FORMAT("%H°%i'%s", SEC_TO_TIME(ROUND(3600 * -123.77)));
+--------------------------------------------------------------+
| TIME_FORMAT("%H°%i'%s", SEC_TO_TIME(ROUND(3600 * -123.77)))  |
+--------------------------------------------------------------+
| -123:46:12                                                   |
+--------------------------------------------------------------+

(The ROUND is to avoid getting 3 decimal places in the answer.)