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不使用function计算给定两个日期之间的工作日个数

2019-11-18 13:20:53
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  可能这就是Oracle的work_days函数的算法吧
  
  Calculating Working Days Without Using a Function
  
  This tip comes from Mike Selvaggio, Senior DB Architect and DBA at Orsel Consulting Inc. in North Brunswick, NJ.
  
  If you need to calculate working days between two dates and you can't create the Oracle-recommended working days function, here is SQL that can accomplish the same task:
  
  SQL> set linesize 100
  SQL> desc date_test
  Name Null? Type
  START_DT DATE
  END_DT DATE
  
  SQL> select * from date_test
  2 .
  SQL> /
  
  START_DT END_DT
  --------- ---------
  13-DEC-02 18-DEC-02
  17-DEC-02 19-DEC-02
  18-DEC-02 23-DEC-02
  26-DEC-02 28-DEC-02
  
  SQL> select start_dt, end_dt, end_dt - start_dt age,
  work_days(start_dt, end_dt) from date_test;
  
  START_DT END_DT AGE WORK_DAYS(START_DT,END_DT)
  --------- --------- ---------- --------------------------
  13-DEC-02 18-DEC-02 5 3
  17-DEC-02 19-DEC-02 2 2
  18-DEC-02 23-DEC-02 5 3
  26-DEC-02 28-DEC-02 2 1
  
  
  SQL> get workingdays
  代码:
  select start_dt, end_dt, trunc(end_dt - start_dt) age,
  (trunc(end_dt - start_dt) - (
  (case
  WHEN (8-to_number(to_char(start_dt,'D') )) > trunc(end_dt -start_dt)+1
  THEN 0
  ELSE
  trunc( (trunc(end_dt - start_dt) -(8-to_number(to_char(start_dt,'D') ))) / 7 ) + 1 END) +
  (case
  WHEN mod(8-to_char(start_dt,'D'),7) > trunc(end_dt - start_dt)-1
  THEN 0
  ELSE
  trunc( (trunc(end_dt-start_dt) - (mod(8-to_char(start_dt,'D'),7)+1)) / 7 ) + 1
   END) ) ) workingdays
  from date_test
  
  SQL> /
  
  START_DT END_DT AGE WORKINGDAYS
  --------- --------- ---------- -----------
  13-DEC-02 18-DEC-02 5 3
  17-DEC-02 19-DEC-02 2 2
  18-DEC-02 23-DEC-02 5 3
  26-DEC-02 28-DEC-02 2 1

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