Hello,
je cherche à optimiser cette requête qui prend au moins 20 secondes a chaque lancement . Quelqu'un aurait une idée svp ?

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SELECT top 10 A.STD_ID_HR
,CASE
WHEN A.STD_DT_START>=B.SFR_DT_START AND A.STD_DT_START>=C.SFR_DT_START AND A.STD_DT_START>=D.SFR_DT_START AND A.STD_DT_START>=E.STD_DT_START AND A.STD_DT_START>=F.SFR_DT_START AND A.STD_DT_START>=G.SFR_DT_START AND A.STD_DT_START>=H.SFR_DT_START AND A.STD_DT_START>=I.SFR_DT_START THEN A.STD_DT_START
WHEN B.SFR_DT_START>=A.STD_DT_START AND B.SFR_DT_START>=C.SFR_DT_START AND B.SFR_DT_START>=D.SFR_DT_START AND B.SFR_DT_START>=E.STD_DT_START AND B.SFR_DT_START>=F.SFR_DT_START AND B.SFR_DT_START>=G.SFR_DT_START AND B.SFR_DT_START>=H.SFR_DT_START AND B.SFR_DT_START>=I.SFR_DT_START THEN B.SFR_DT_START
WHEN C.SFR_DT_START>=A.STD_DT_START AND C.SFR_DT_START>=B.SFR_DT_START AND C.SFR_DT_START>=D.SFR_DT_START AND C.SFR_DT_START>=E.STD_DT_START AND C.SFR_DT_START>=F.SFR_DT_START AND C.SFR_DT_START>=G.SFR_DT_START AND C.SFR_DT_START>=H.SFR_DT_START AND C.SFR_DT_START>=I.SFR_DT_START THEN C.SFR_DT_START
WHEN D.SFR_DT_START>=A.STD_DT_START AND D.SFR_DT_START>=B.SFR_DT_START AND D.SFR_DT_START>=C.SFR_DT_START AND D.SFR_DT_START>=E.STD_DT_START AND D.SFR_DT_START>=F.SFR_DT_START AND D.SFR_DT_START>=G.SFR_DT_START AND D.SFR_DT_START>=H.SFR_DT_START AND D.SFR_DT_START>=I.SFR_DT_START THEN D.SFR_DT_START
WHEN E.STD_DT_START>=A.STD_DT_START AND E.STD_DT_START>=B.SFR_DT_START AND E.STD_DT_START>=C.SFR_DT_START AND E.STD_DT_START>=D.SFR_DT_START AND E.STD_DT_START>=F.SFR_DT_START AND E.STD_DT_START>=G.SFR_DT_START AND E.STD_DT_START>=H.SFR_DT_START AND E.STD_DT_START>=I.SFR_DT_START THEN E.STD_DT_START
WHEN F.SFR_DT_START>=A.STD_DT_START AND F.SFR_DT_START>=B.SFR_DT_START AND F.SFR_DT_START>=C.SFR_DT_START AND F.SFR_DT_START>=D.SFR_DT_START AND F.SFR_DT_START>=E.STD_DT_START AND F.SFR_DT_START>=G.SFR_DT_START AND F.SFR_DT_START>=H.SFR_DT_START AND F.SFR_DT_START>=I.SFR_DT_START THEN F.SFR_DT_START
WHEN G.SFR_DT_START>=A.STD_DT_START AND G.SFR_DT_START>=B.SFR_DT_START AND G.SFR_DT_START>=C.SFR_DT_START AND G.SFR_DT_START>=D.SFR_DT_START AND G.SFR_DT_START>=E.STD_DT_START AND G.SFR_DT_START>=F.SFR_DT_START AND G.SFR_DT_START>=H.SFR_DT_START AND G.SFR_DT_START>=I.SFR_DT_START THEN G.SFR_DT_START
WHEN H.SFR_DT_START>=A.STD_DT_START AND H.SFR_DT_START>=B.SFR_DT_START AND H.SFR_DT_START>=C.SFR_DT_START AND H.SFR_DT_START>=D.SFR_DT_START AND H.SFR_DT_START>=E.STD_DT_START AND H.SFR_DT_START>=F.SFR_DT_START AND H.SFR_DT_START>=G.SFR_DT_START AND H.SFR_DT_START>=I.SFR_DT_START THEN H.SFR_DT_START
WHEN I.SFR_DT_START>=A.STD_DT_START AND I.SFR_DT_START>=B.SFR_DT_START AND I.SFR_DT_START>=C.SFR_DT_START AND I.SFR_DT_START>=D.SFR_DT_START AND I.SFR_DT_START>=E.STD_DT_START AND I.SFR_DT_START>=F.SFR_DT_START AND I.SFR_DT_START>=G.SFR_DT_START AND I.SFR_DT_START>=H.SFR_DT_START THEN I.SFR_DT_START
END
,CASE
WHEN A.STD_DT_END<=B.SFR_DT_END AND A.STD_DT_END<=C.SFR_DT_END AND A.STD_DT_END<=D.SFR_DT_END AND A.STD_DT_END<=E.STD_DT_END AND A.STD_DT_END<=F.SFR_DT_END AND A.STD_DT_END<=G.SFR_DT_END AND A.STD_DT_END<=H.SFR_DT_END AND A.STD_DT_END<=I.SFR_DT_END THEN A.STD_DT_END
WHEN B.SFR_DT_END<=A.STD_DT_END AND B.SFR_DT_END<=C.SFR_DT_END AND B.SFR_DT_END<=D.SFR_DT_END AND B.SFR_DT_END<=E.STD_DT_END AND B.SFR_DT_END<=F.SFR_DT_END AND B.SFR_DT_END<=G.SFR_DT_END AND B.SFR_DT_END<=H.SFR_DT_END AND B.SFR_DT_END<=I.SFR_DT_END THEN B.SFR_DT_END
WHEN C.SFR_DT_END<=A.STD_DT_END AND C.SFR_DT_END<=B.SFR_DT_END AND C.SFR_DT_END<=D.SFR_DT_END AND C.SFR_DT_END<=E.STD_DT_END AND C.SFR_DT_END<=F.SFR_DT_END AND C.SFR_DT_END<=G.SFR_DT_END AND C.SFR_DT_END<=H.SFR_DT_END AND C.SFR_DT_END<=I.SFR_DT_END THEN C.SFR_DT_END
WHEN D.SFR_DT_END<=A.STD_DT_END AND D.SFR_DT_END<=B.SFR_DT_END AND D.SFR_DT_END<=C.SFR_DT_END AND D.SFR_DT_END<=E.STD_DT_END AND D.SFR_DT_END<=F.SFR_DT_END AND D.SFR_DT_END<=G.SFR_DT_END AND D.SFR_DT_END<=H.SFR_DT_END AND D.SFR_DT_END<=I.SFR_DT_END THEN D.SFR_DT_END
WHEN E.STD_DT_END<=A.STD_DT_END AND E.STD_DT_END<=B.SFR_DT_END AND E.STD_DT_END<=C.SFR_DT_END AND E.STD_DT_END<=D.SFR_DT_END AND E.STD_DT_END<=F.SFR_DT_END AND E.STD_DT_END<=G.SFR_DT_END AND E.STD_DT_END<=H.SFR_DT_END AND E.STD_DT_END<=I.SFR_DT_END THEN E.STD_DT_END
WHEN F.SFR_DT_END<=A.STD_DT_END AND F.SFR_DT_END<=B.SFR_DT_END AND F.SFR_DT_END<=C.SFR_DT_END AND F.SFR_DT_END<=D.SFR_DT_END AND F.SFR_DT_END<=E.STD_DT_END AND F.SFR_DT_END<=G.SFR_DT_END AND F.SFR_DT_END<=H.SFR_DT_END AND F.SFR_DT_END<=I.SFR_DT_END THEN F.SFR_DT_END
WHEN G.SFR_DT_END<=A.STD_DT_END AND G.SFR_DT_END<=B.SFR_DT_END AND G.SFR_DT_END<=C.SFR_DT_END AND G.SFR_DT_END<=D.SFR_DT_END AND G.SFR_DT_END<=E.STD_DT_END AND G.SFR_DT_END<=F.SFR_DT_END AND G.SFR_DT_END<=H.SFR_DT_END AND G.SFR_DT_END<=I.SFR_DT_END THEN G.SFR_DT_END
WHEN H.SFR_DT_END<=A.STD_DT_END AND H.SFR_DT_END<=B.SFR_DT_END AND H.SFR_DT_END<=C.SFR_DT_END AND H.SFR_DT_END<=D.SFR_DT_END AND H.SFR_DT_END<=E.STD_DT_END AND H.SFR_DT_END<=F.SFR_DT_END AND H.SFR_DT_END<=G.SFR_DT_END AND H.SFR_DT_END<=I.SFR_DT_END THEN H.SFR_DT_END
WHEN I.SFR_DT_END<=A.STD_DT_END AND I.SFR_DT_END<=B.SFR_DT_END AND I.SFR_DT_END<=C.SFR_DT_END AND I.SFR_DT_END<=D.SFR_DT_END AND I.SFR_DT_END<=E.STD_DT_END AND I.SFR_DT_END<=F.SFR_DT_END AND I.SFR_DT_END<=G.SFR_DT_END AND I.SFR_DT_END<=H.SFR_DT_END THEN I.SFR_DT_END
END
,A1.STD_N_FAM_NAME_1
,A.STD_DT_START
,A.STD_DT_END
,A.STD_OR_HR_PERIOD
,B.SFR_DT_START
,B.SFR_DT_END
,B.SFR_ID_S_LEG_ENT
,B1.SFR_NM_S_LEG_ENT
,B1.SFR_ID_LEG_ENT
,B2.STD_N_LEG_ENT
,C.SFR_DT_START
,C.SFR_DT_END
,C.SFR_ID_LAB_AGREE
,C1.SFR_NM_LAB_AGREE
,D.SFR_DT_START
,D.SFR_DT_END
,D.SFR_ID_CAT_SP
,D1.SFR_NM_CAT_SP
,E.STD_DT_START
,E.STD_DT_END
,E.STD_ID_CONT_TYPE
,E1.STD_N_CONT_TYPE
,F.SFR_DT_START
,F.SFR_DT_END
,F.SFR_ID_CAT_SOC_SEC
,F1.SFR_NM_CAT_SOC_SEC
,G.SFR_DT_START
,G.SFR_DT_END
,G.M4SFR_ID_CAT_RETR
,G1.M4SFR_NM_CAT_RETR
,H.SFR_DT_START
,H.SFR_DT_END
,H.M4SFR_ID_CAT_PREV
,H1.M4SFR_NM_CAT_PREV
,I.SFR_DT_START
,I.SFR_DT_END
,I.SFR_ID_CAT_MUTUELL
,I1.SFR_NM_CAT_MUTUELL
FROM STD_HR_PERIOD A
,STD_PERSON A1
,M4SFR_H_HR_SUB_LE B
,M4SFR_SUB_LEG_ENT B1
,STD_LEG_ENT B2
,M4SFR_H_HR_LAB_AG C
,M4SFR_LAB_AGREE C1
,M4SFR_H_HR_CAT_SP D
,M4SFR_X_CAT_SOC_PR D1
,STD_INT_WORK_CONT E
,STD_CONTRACT_TYPE E1
,M4SFR_H_HR_CAT_SS F
,M4SFR_X_CAT_SS F1
,M4SFR_H_HR_CAT_RET G
,M4SFR_X_CAT_RETR G1
,M4SFR_H_HR_CAT_PRE H
,M4SFR_X_CAT_PREVOY H1
,M4SFR_H_HR_CAT_MUT I
,M4SFR_X_CAT_MUTUEL I1
WHERE A.STD_ID_HR = A1.STD_ID_PERSON
/* Etablissement, Société */
AND A.STD_ID_HR = B.SCO_ID_HR
AND A.STD_OR_HR_PERIOD = B.SCO_OR_HR_PERIOD
AND B.SFR_DT_START <= C.SFR_DT_END AND B.SFR_DT_END >= C.SFR_DT_START
AND B.SFR_DT_START <= D.SFR_DT_END AND B.SFR_DT_END >= D.SFR_DT_START
AND B.SFR_DT_START <= E.STD_DT_END AND B.SFR_DT_END >= E.STD_DT_START
AND B.SFR_DT_START <= F.SFR_DT_END AND B.SFR_DT_END >= F.SFR_DT_START
AND B.SFR_DT_START <= G.SFR_DT_END AND B.SFR_DT_END >= G.SFR_DT_START
AND B.SFR_DT_START <= H.SFR_DT_END AND B.SFR_DT_END >= H.SFR_DT_START
AND B.SFR_DT_START <= I.SFR_DT_END AND B.SFR_DT_END >= I.SFR_DT_START
AND B.SFR_ID_S_LEG_ENT = B1.SFR_ID_S_LEG_ENT
AND B1.SFR_ID_LEG_ENT = B2.STD_ID_LEG_ENT
/* Conv. Collective */
AND A.STD_ID_HR = C.SFR_ID_HR
AND A.STD_OR_HR_PERIOD = C.SFR_OR_HR_PERIOD
AND C.SFR_DT_START <= B.SFR_DT_END AND C.SFR_DT_END >= B.SFR_DT_START
AND C.SFR_DT_START <= D.SFR_DT_END AND C.SFR_DT_END >= D.SFR_DT_START
AND C.SFR_DT_START <= E.STD_DT_END AND C.SFR_DT_END >= E.STD_DT_START
AND C.SFR_DT_START <= F.SFR_DT_END AND C.SFR_DT_END >= F.SFR_DT_START
AND C.SFR_DT_START <= G.SFR_DT_END AND C.SFR_DT_END >= G.SFR_DT_START
AND C.SFR_DT_START <= H.SFR_DT_END AND C.SFR_DT_END >= H.SFR_DT_START
AND C.SFR_DT_START <= I.SFR_DT_END AND C.SFR_DT_END >= I.SFR_DT_START
AND C.SFR_ID_LAB_AGREE = C1.SFR_ID_LAB_AGREE
/* Catégorie Socio-Pro */
AND A.STD_ID_HR = D.SFR_ID_HR
AND A.STD_OR_HR_PERIOD = D.SFR_OR_HR_PERIOD
AND D.SFR_DT_START <= B.SFR_DT_END AND D.SFR_DT_END >= B.SFR_DT_START
AND D.SFR_DT_START <= C.SFR_DT_END AND D.SFR_DT_END >= C.SFR_DT_START
AND D.SFR_DT_START <= E.STD_DT_END AND D.SFR_DT_END >= E.STD_DT_START
AND D.SFR_DT_START <= F.SFR_DT_END AND D.SFR_DT_END >= F.SFR_DT_START
AND D.SFR_DT_START <= G.SFR_DT_END AND D.SFR_DT_END >= G.SFR_DT_START
AND D.SFR_DT_START <= H.SFR_DT_END AND D.SFR_DT_END >= H.SFR_DT_START
AND D.SFR_DT_START <= I.SFR_DT_END AND D.SFR_DT_END >= I.SFR_DT_START
AND D.SFR_ID_CAT_SP = D1.SFR_ID_CAT_SP
/* Contrat Interne */
AND A.STD_ID_HR = E.STD_ID_HR
AND A.STD_OR_HR_PERIOD = E.STD_OR_HR_PERIOD
AND E.STD_DT_START <= B.SFR_DT_END AND E.STD_DT_END >= B.SFR_DT_START
AND E.STD_DT_START <= C.SFR_DT_END AND E.STD_DT_END >= C.SFR_DT_START
AND E.STD_DT_START <= D.SFR_DT_END AND E.STD_DT_END >= D.SFR_DT_START
AND E.STD_DT_START <= F.SFR_DT_END AND E.STD_DT_END >= F.SFR_DT_START
AND E.STD_DT_START <= G.SFR_DT_END AND E.STD_DT_END >= G.SFR_DT_START
AND E.STD_DT_START <= H.SFR_DT_END AND E.STD_DT_END >= H.SFR_DT_START
AND E.STD_DT_START <= I.SFR_DT_END AND E.STD_DT_END >= I.SFR_DT_START
AND E.STD_ID_CONT_TYPE = E1.STD_ID_CONT_TYPE
/* Cat Sécurité Sociale */
AND A.STD_ID_HR = F.SFR_ID_HR
AND A.STD_OR_HR_PERIOD = F.SFR_OR_HR_PERIOD
AND F.SFR_DT_START <= B.SFR_DT_END AND F.SFR_DT_END >= B.SFR_DT_START
AND F.SFR_DT_START <= C.SFR_DT_END AND F.SFR_DT_END >= C.SFR_DT_START
AND F.SFR_DT_START <= D.SFR_DT_END AND F.SFR_DT_END >= D.SFR_DT_START
AND F.SFR_DT_START <= E.STD_DT_END AND F.SFR_DT_END >= E.STD_DT_START
AND F.SFR_DT_START <= G.SFR_DT_END AND F.SFR_DT_END >= G.SFR_DT_START
AND F.SFR_DT_START <= H.SFR_DT_END AND F.SFR_DT_END >= H.SFR_DT_START
AND F.SFR_DT_START <= I.SFR_DT_END AND F.SFR_DT_END >= I.SFR_DT_START
AND F.SFR_ID_CAT_SOC_SEC = F1.SFR_ID_CAT_SOC_SEC
/* Cat Retraite */
AND A.STD_ID_HR = G.STD_ID_HR
AND A.STD_OR_HR_PERIOD = G.STD_OR_HR_PERIOD
AND G.SFR_DT_START <= B.SFR_DT_END AND G.SFR_DT_END >= B.SFR_DT_START
AND G.SFR_DT_START <= C.SFR_DT_END AND G.SFR_DT_END >= C.SFR_DT_START
AND G.SFR_DT_START <= D.SFR_DT_END AND G.SFR_DT_END >= D.SFR_DT_START
AND G.SFR_DT_START <= E.STD_DT_END AND G.SFR_DT_END >= E.STD_DT_START
AND G.SFR_DT_START <= F.SFR_DT_END AND G.SFR_DT_END >= F.SFR_DT_START
AND G.SFR_DT_START <= H.SFR_DT_END AND G.SFR_DT_END >= H.SFR_DT_START
AND G.SFR_DT_START <= I.SFR_DT_END AND G.SFR_DT_END >= I.SFR_DT_START
AND G.M4SFR_ID_CAT_RETR = G1.M4SFR_ID_CAT_RETR
/* Cat Prévoyance */
AND A.STD_ID_HR = H.STD_ID_HR
AND A.STD_OR_HR_PERIOD = H.STD_OR_HR_PERIOD
AND H.SFR_DT_START <= B.SFR_DT_END AND H.SFR_DT_END >= B.SFR_DT_START
AND H.SFR_DT_START <= C.SFR_DT_END AND H.SFR_DT_END >= C.SFR_DT_START
AND H.SFR_DT_START <= D.SFR_DT_END AND H.SFR_DT_END >= D.SFR_DT_START
AND H.SFR_DT_START <= E.STD_DT_END AND H.SFR_DT_END >= E.STD_DT_START
AND H.SFR_DT_START <= F.SFR_DT_END AND H.SFR_DT_END >= F.SFR_DT_START
AND H.SFR_DT_START <= G.SFR_DT_END AND H.SFR_DT_END >= G.SFR_DT_START
AND H.SFR_DT_START <= I.SFR_DT_END AND H.SFR_DT_END >= I.SFR_DT_START
AND H.M4SFR_ID_CAT_PREV = H1.M4SFR_ID_CAT_PREV
/* Cat Mutuelle */
AND A.STD_ID_HR = I.STD_ID_HR
AND A.STD_OR_HR_PERIOD = I.STD_OR_HR_PERIOD
AND I.SFR_DT_START <= B.SFR_DT_END AND I.SFR_DT_END >= B.SFR_DT_START
AND I.SFR_DT_START <= C.SFR_DT_END AND I.SFR_DT_END >= C.SFR_DT_START
AND I.SFR_DT_START <= D.SFR_DT_END AND I.SFR_DT_END >= D.SFR_DT_START
AND I.SFR_DT_START <= E.STD_DT_END AND I.SFR_DT_END >= E.STD_DT_START
AND I.SFR_DT_START <= F.SFR_DT_END AND I.SFR_DT_END >= F.SFR_DT_START
AND I.SFR_DT_START <= G.SFR_DT_END AND I.SFR_DT_END >= G.SFR_DT_START
AND I.SFR_DT_START <= H.SFR_DT_END AND I.SFR_DT_END >= H.SFR_DT_START
AND I.SFR_ID_CAT_MUTUELL = I1.SFR_ID_CAT_MUTUELL
/* Critères */
AND A.STD_ID_HR_TYPE = '01'
Merci par avance de votre aide