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    <p>One solution to this problem is:</p> <p>1) A job is a time interval, and you need to generate 1 tuple for each day. If a job start today and ends tomorrow you need 2 tuples (today and tomorrow dates). You can do this with:</p> <pre><code>SELECT JOBID, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM ( SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS) ), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) </code></pre> <p>2) You have to fix SHIFT table (on some tuples ending time is 0:00:00, this is the hour of the next day). You can use:</p> <pre><code>SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') </code></pre> <p>This select includes a SHIFTENDOFFSET : 0 if the hour is in the starting day and 1 if the hour is in the day after the starting day.</p> <p>3) Now you can join both using the day of SHIFTS and the day of “every job day”, and filter impossible tuples (those days when the job begins after the shift ends)</p> <pre><code>SELECT JOBID, GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART), LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND), 24*(LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)) TOTAL FROM (SELECT JOBID, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS wHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS')) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) ORDER BY 1,2 </code></pre> <p>4) group by JOBID and SUM to get the total hours.</p> <pre><code>SELECT JOBID, 24*SUM(LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)) TOTAL FROM (SELECT JOBID, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS')) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) GROUP BY JOBID </code></pre> <p>5) And finally, apply your expected output format:</p> <p><code>SELECT JOBID "Job_ID", JOBSTART "Start_Time", JOBEND "End_Time", TRUNC(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)))||' '|| TO_CHAR(TRUNC(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24),'FM00')||':'|| TO_CHAR(TRUNC(MOD(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24,1)*60),'FM00')||':'|| TO_CHAR(TRUNC(MOD(MOD(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24,1)*60,1)*60),'FM00') "Shift Timings" FROM (SELECT JOBID, JOBSTART, JOBEND, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') ) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) GROUP BY JOBID, JOBSTART, JOBEND</code></p> <p>In your example you say that job 1 accumulate 42 hours, but this is not correct. Job 1 has more than 52 hours. Job 3 has 42 hours.</p> <p>You can use the following script (it creates JOBS and SHIFTS tables, introduces your samples rows and perform 3), 4) and 5) queries):</p> <pre><code>ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS DAY'; DROP TABLE JOBS; DROP TABLE SHIFTS; CREATE TABLE JOBS (JOBID NUMBER, JOBSTART DATE, JOBEND DATE); CREATE TABLE SHIFTS (SHIFTSTART VARCHAR2(8), SHIFTEND VARCHAR2(8), DAY VARCHAR2(13)); INSERT INTO JOBS VALUES (1, TO_DATE('01.12.2013 16:38:56','DD.MM.YYYY HH24:MI:SS'), TO_DATE('09.12.2013 10:38:56','DD.MM.YYYY HH24:MI:SS')); INSERT INTO JOBS VALUES (2, TO_DATE('11.11.2013 10:14:13','DD.MM.YYYY HH24:MI:SS'), TO_DATE('07.12.2013 12:28:26','DD.MM.YYYY HH24:MI:SS')); INSERT INTO JOBS VALUES (3, TO_DATE('29.11.2013 08:20:22','DD.MM.YYYY HH24:MI:SS'), TO_DATE('05.12.2013 07:18:17','DD.MM.YYYY HH24:MI:SS')); -- Fix the start hour to 0:00:00 instead of 0:00 INSERT INTO SHIFTS VALUES ('0:0:00','6:00:00','Monday'); INSERT INTO SHIFTS VALUES ('6:00:00','12:00:00','Monday'); INSERT INTO SHIFTS VALUES ('12:00:00','0:00:00','Tuesday'); INSERT INTO SHIFTS VALUES ('0:00:00','6:00:00','Wednesday'); INSERT INTO SHIFTS VALUES ('6:00:00','12:00:00','Saturday'); INSERT INTO SHIFTS VALUES ('6:00:00','12:00:00','Sunday'); COMMIT; SELECT JOBID, GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART), LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND), 24*( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)) TOTAL FROM (SELECT JOBID, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') ) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) ORDER BY 1,2; SELECT JOBID, 24*SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)) TOTAL FROM (SELECT JOBID, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') ) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) GROUP BY JOBID; SELECT JOBID "Job_ID", JOBSTART "Start_Time", JOBEND "End_Time", TRUNC(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)))||' '|| TO_CHAR(TRUNC(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24),'FM00')||':'|| TO_CHAR(TRUNC(MOD(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24,1)*60),'FM00')||':'|| TO_CHAR(TRUNC(MOD(MOD(MOD(SUM( LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) - GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART)),1)*24,1)*60,1)*60),'FM00') "Shift Timings" FROM (SELECT JOBID, JOBSTART, JOBEND, GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) JOBDAYSTART, LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD')) JOBDAYEND, NDAY FROM (SELECT LEVEL NDAY FROM DUAL CONNECT BY LEVEL &lt;= (SELECT CEIL(MAX(JOBEND - JOBSTART))+1 FROM JOBS)), JOBS WHERE GREATEST(JOBSTART, TRUNC(JOBSTART+(NDAY-1),'DDD')) &lt;= LEAST(JOBEND, TRUNC(JOBEND+NDAY,'DDD'))) JOIN (SELECT SHIFTSTART, SHIFTEND, DAY, 0 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &lt;= TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') UNION SELECT SHIFTSTART, SHIFTEND, DAY, 1 SHIFTENDOFFSET FROM SHIFTS WHERE TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS') &gt; TO_DATE(TO_CHAR(SYSDATE,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') ) ON (TO_CHAR(JOBDAYSTART, 'Day','nls_date_language=english') LIKE (DAY||'%')) WHERE LEAST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTEND,'YYYY-MM-DD HH24:MI:SS') + SHIFTENDOFFSET, JOBDAYEND) &gt; GREATEST(TO_DATE(TO_CHAR(JOBDAYSTART,'YYYY-MM-DD ') || SHIFTSTART,'YYYY-MM-DD HH24:MI:SS'), JOBDAYSTART) GROUP BY JOBID, JOBSTART, JOBEND; </code></pre>
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