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我有一个带有日期列和这样的列的表：

Column
01-00-00-00
01-02-00-00
03-06-00-00
05-13-00-00
....

我想要做什么：找出每天有多少条目以“01”、“02”、“03”、...开头。因此我需要先减去前 2 个字符，计算它们并按日期分组。

我有一个运行良好的代码，但需要很长的时间。你有一个更简单的查询的想法吗？

    SELECT
      Date,
      sum(IIF(Platz='03',1,0)) as Gang_03,
      sum(IIF(Platz='04',1,0)) as Gang_04,
      sum(IIF(Platz='05',1,0)) as Gang_05,
      sum(IIF(Platz='06',1,0)) as Gang_06,
      sum(IIF(Platz='07',1,0)) as Gang_07,
      sum(IIF(Platz='08',1,0)) as Gang_08,
      sum(IIF(Platz='09',1,0)) as Gang_09,
      sum(IIF(Platz='10',1,0)) as Gang_10,
      sum(IIF(Platz='11',1,0)) as Gang_11,
      sum(IIF(Platz='12',1,0)) as Gang_12,
      sum(IIF(Platz='13',1,0)) as Gang_13,
      sum(IIF(Platz='14',1,0)) as Gang_14,
      sum(IIF(Platz='15',1,0)) as Gang_15,
      sum(IIF(Platz='16',1,0)) as Gang_16,
      sum(IIF(Platz='17',1,0)) as Gang_17,
      sum(IIF(Platz='18',1,0)) as Gang_18,
      sum(IIF(Platz='19',1,0)) as Gang_19,
      sum(IIF(Platz='20',1,0)) as Gang_20
    FROM
      (
      SELECT
            time_neu as Date,
            LEFT(Platz_von,2) as Platz
      FROM
            00_Gesamt_Pickauf
      )
    GROUP BY
      Date
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