如何使用T-SQL文本函數之一獲取字符串的一部分

Question

我有以下片段：

 CONVERT(varchar, FLOOR(ROUND((DATEDIFF(minute, shiftStart.timeEntered, shiftEnd.timeEntered) - DATEDIFF(minute, 
                      lunchStart.timeEntered, lunchEnd.timeEntered)) * 1.0 / 60, 2, 1))) + ':' + CONVERT(varchar, ROUND(ROUND(DATEDIFF(minute, shiftStart.timeEntered, 
                      shiftEnd.timeEntered) * 1.0 / 60, 2, 1) % 1 * 60, 0)) AS WorkingHours

上面的代碼以以下格式打印小時和分鍾：

4:30.000000
7:40.000000
8:1.000000

我需要擺脫。 和下一個0，所以我得到以下格式：

4:30 (4 hours and 30 mins)
7:40 (7 hours and 40 minutes)
8:1 (means 8 hours and 1 minute)

.0000無害，但外觀不好

Answer 1

將分鍾部分轉換為INTeger，然后再轉換為VARCHAR以刪除十進制值：

CONVERT(VARCHAR, 
        CONVERT(INT, ROUND(ROUND(DATEDIFF(minute, shiftStart.timeEntered, shiftEnd.timeEntered) * 1.0 / 60, 2, 1) % 1 * 60, 0))) 

完整示例：

CONVERT(varchar, FLOOR(ROUND((DATEDIFF(minute, shiftStart.timeEntered, shiftEnd.timeEntered) - DATEDIFF(minute, lunchStart.timeEntered, lunchEnd.timeEntered)) * 1.0 / 60, 2, 1))) + ':' + 
CONVERT(VARCHAR, CONVERT(INT, ROUND(ROUND(DATEDIFF(minute, shiftStart.timeEntered, shiftEnd.timeEntered) * 1.0 / 60, 2, 1) % 1 * 60, 0))) AS WorkingHours