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| - | ====== Omnidex SQL Function: $COMPARE_DATE ====== | ||
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| - | ===== Description ===== | ||
| - | The $COMPARE_DATES function determines the interval between two dates and returns that value as a fractional floating point value. The interval will default to days unless overridden using the unit parameter. | ||
| - | ===== Syntax ===== | ||
| - | |||
| - | $COMPARE_DATES ( <date_column1 | 'date_string1' > , < date_column2 | 'date_string2 > | ||
| - | [, [date_unit] | ||
| - | [, options] | ||
| - | ) | ||
| - | |||
| - | ===== Discussion ===== | ||
| - | == < date_column1 | 'date_string1' > == | ||
| - | An expression resulting in a date-class or string-class datatype | ||
| - | |||
| - | == < date_column2 | 'date_string2' > == | ||
| - | An expression resulting in a date-class or string-class datatype | ||
| - | |||
| - | == date_unit == | ||
| - | A string containing a unit abbreviation identifying the type of interval. The supported abbreviations are the same as those found in the EXTRACT function. | ||
| - | |||
| - | Valid date_unit options: | ||
| - | ^ Date_unit ^ Description ^ | ||
| - | | YEAR | Year | | ||
| - | | MONTH | Month | | ||
| - | | DAY | Day | | ||
| - | | HOUR | Hour | | ||
| - | | MINUTE | Minute | | ||
| - | | SECOND | Second | | ||
| - | | A | Lowercase am/pm indicator | | ||
| - | | AA | Uppercase AM/PM indicator | | ||
| - | | D | Non-zero-filled day-of-month (1, 2, 3) | | ||
| - | | 0D | Zero-filled day-of-month (01, 02, 03) | | ||
| - | | DD | Day of year (44) | | ||
| - | | 0DD | Zero-filled day of year (044) | | ||
| - | | F | Non-zero-filled fraction of a second (1, 2) | | ||
| - | | 0F | Zero-filled fraction of a second (01, 02) | | ||
| - | | H | 12-hour, non-zero-filled hour of day (12, 1) | | ||
| - | | 0H | 12-hour, zero-filled hour of day (12, 01) | | ||
| - | | HH | 24-hour, non-zero-filled hour of day (24, 1) | | ||
| - | | 0HH | 24-hour, zero-filled hour of day (24, 01) | | ||
| - | | J | Non-zero-filled Julian date (1, 2) | | ||
| - | | 0J | Zero-filled Julian date (01, 02) | | ||
| - | | M | Non-zero-filled month number (1-January, 2-February) | | ||
| - | | 0M | Zero-filled day-of-month number (01-January, 02-February) | | ||
| - | | MM | Three-character month abbreviation (Jan, Feb) | | ||
| - | | MMM | Fully spelled month (January, February) | | ||
| - | | N | Non-zero-filled minute of hour (1, 2) | | ||
| - | | 0N | Zero-filled minute of hour (01, 02) | | ||
| - | | Q | Quarter of the year (1) | | ||
| - | | QQ | Quarter of the year abbreviation (Q1) | | ||
| - | | QQQ | Quarter of the year name (First Quarter) | | ||
| - | | S | Non-zero-filled second of minute (1, 2) | | ||
| - | | 0S | Zero-filled second of minute (01, 02) | | ||
| - | | W | Day of the week number (1-Sunday, 2-Monday) | | ||
| - | | WW | Three-character day-of-week abbreviation (Sun, Mon) | | ||
| - | | WWW | Fully spelled day-of-week (Sunday, Monday) | | ||
| - | | YY | Two-digit year (99, 00) | | ||
| - | | YYYY | Four-digit year (1999, 2000) | | ||
| - | |||
| - | == options == | ||
| - | A string containing options for this functions. No options exist at this time. | ||
| - | |||
| - | The result of the $COMPARE_DATES function is an INTEGER datatype reflecting the number of units between the two dates. | ||
| - | |||
| - | |||
| - | ===== Example ===== | ||
| - | ==== Example 1 ==== | ||
| - | |||
| - | <code> | ||
| - | > select $compare_date('20090101', current_date, 'DD') from $omnidex | ||
| - | |||
| - | $COMPARE_DA | ||
| - | ----------- | ||
| - | 462 | ||
| - | </code> | ||
| - | |||
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