How to Save Condition Case or IF to variabel in MySQL -



how save condition case or if variabel?
dont need write same condition again next.

this mysql syntax :

select  v_jadwal_personal.id_karyawan,                         v_jadwal_personal.nik_karyawan, (case when     (select wkt_masuk d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) < 0     addtime(jam_masuk,(select wkt_plg d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)) when     (select wkt_masuk d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) >= 0     addtime(jam_masuk,(select wkt_plg d_jamkerja_khusus      tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)) end) jammasuk, (case when     (select wkt_plg d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) < 0     addtime(jam_pulang,(select wkt_plg d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)) when     (select wkt_plg d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) >= 0     addtime(jam_pulang,(select wkt_plg d_jamkerja_khusus      tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)) end) jampulang,                         v_jadwal_personal.totaljam,                         v_tmp_history_absensi.waktu_masuk,                         v_tmp_history_absensi.waktu_pulang,                         v_tmp_history_absensi.hari_kerja,                         v_tmp_history_absensi.tgl_kerja,                         v_tmp_history_absensi.nama_karyawan,                         timediff(waktu_pulang,waktu_masuk) totaljamkerja,                         (case when     (select wkt_masuk d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) < 0     timediff(waktu_masuk,(addtime(jam_masuk,(select wkt_plg d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)))) when     (select wkt_masuk d_jamkerja_khusus     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) >= 0     timediff(waktu_masuk,(addtime(jam_masuk,(select wkt_plg d_jamkerja_khusus      tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja)))) end)  terlambat,                         timediff(jam_pulang,waktu_pulang) lebihan, (select wkt_masuk d_jamkerja_khusus                     tgl_krj between '2014-05-14' , '2014-05-23' , tgl_krj=v_tmp_history_absensi.tgl_kerja) teswaktu                     v_jadwal_personal join v_tmp_history_absensi                         on v_tmp_history_absensi.id_karyawan = v_jadwal_personal.id_karyawan                         , v_tmp_history_absensi.hari_kerja = v_jadwal_personal.nama_hari                         v_tmp_history_absensi.tgl_kerja between '2014-05-14' , '2014-05-23'                         , v_jadwal_personal.id_karyawan=1

so, think many case condition , thats have same condition..

you can use subquery 1 of tables:

select ...     table         join table on condition         join             (                 select long_computation result                     table                     condition             ) s on condition     condition

then can use s.result.

an alternative use view, that's valid if bit factorise same.


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