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with data as ( select PKDate , row_number() over ( order by PKDate desc) rn from days where PKDate < trunc(sysdate) and is_workday = 1 ) select * from data where rn <= 4
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FROM (SELECT d
FROM (SELECT Trunc(SYSDATE) - LEVEL + 1 d
CONNECT BY LEVEL <= 7)
WHERE Trim(To_char(d, 'Day')) NOT IN ( 'Saturday', 'Sunday' )
ORDER BY d)
WHERE ROWNUM <= 4;
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( GREATEST ( NEXT_DAY ( v_start_date, 'MON') - v_start_date - 2, 0)
+ ((NEXT_DAY ( v_end_date, 'MON') - NEXT_DAY ( v_start_date, 'MON')) / 7) * 5)
- (GREATEST ( NEXT_DAY ( v_end_date, 'MON') - v_end_date - 3, 0))
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