abap不同数据库表（三个）的内关联问题？哪位能给个例子介绍一下 abap中三个表之间的关联怎么建立？写段代码呗?
abap\u5b9a\u4e49\u5185\u8868\u7684\u95ee\u98981. \u4f60\u5199\u7684\u4ee3\u7801\u662f\u600e\u6837\u7684\uff1f\u6709\u53ef\u80fd\u662f\u6ca1\u6ce8\u610fDATA\u548cTYPES\u7684\u533a\u522b\u3002types c1(30) type c.data itab1 type table of c1.data c2(30) type c.data itab2 like table of c2.2. char30\u662f\u4e00\u4e2aData element\uff0c\u76f8\u5f53\u4e8eData typeCHAR\uff0c Length 303. char\u662f\u6570\u636e\u5b57\u5178\u4e2d\u7684\u4e00\u79cd\u6570\u636e\u7c7b\u578b(\u540c\u7c7b\u7684\u6709ACCP\u3001DATS\u3001QUAN\u7b49)\uff0c c\u662fABAP\u4e2d\u7684\u6570\u636e\u7c7b\u578b(\u540c\u7c7b\u7684\u6709C\u3001N\u3001D\u3001T\u3001X\u3001I\u3001P\u3001F\u3001STRING\u3001XSTRING)\u3002\u6570\u636e\u5b57\u5178\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u662fuser interface\u5c42\u5bf9\u6570\u636e\u7684\u5206\u7c7b\uff0c\u7528\u8fd9\u79cd\u5206\u7c7b\u5b9a\u4e49\u7684table field \u3001structure field\u6216data element\u7528\u5728ABAP\u7a0b\u5e8f\u65f6\uff0cABAP\u5904\u7406\u5668\u4f1a\u628a\u5b83\u8f6c\u6362\u6210C\uff0cN\uff0cD\u8fd9\u6837\u7684\u7c7b\u578b\u3002\u5728\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u8868\u65f6\uff0c\u6570\u636e\u5b57\u5178\u7684\u6570\u636e\u7c7b\u578b\u5c31\u4f1a\u8f6c\u6362\u6210\u6570\u636e\u5e93\u7cfb\u7edf\u6240\u7528\u7684\u7c7b\u578b\u3002
\u5148\u628a3\u4e2a\u8868\u90fd\u63d2\u5165\u5185\u8868
\u5faa\u73af\u5176\u4e2d\u4e00\u4e2a\u8868\uff0c\u5728read\u53e6\u5916\u7684\u8868\uff0c\u8fd9\u6837\u53ef\u4ee5\u65b9\u4fbf\u4e00\u9700\u8981\u5904\u7406\u6570\u636e\u7684\u60c5\u51b5
select single c~pspid c~post1 into (it_prchg-pspid , it_prchg-post1)
from ebkn as a
inner join prps as b on a~ps_psp_pnr = b~pspnr "内联WBS元素的表
inner join proj as c on b~paphi = c~pspnr "内联项目的表
where banfn = it_prchg-banfn.
给你个更多表连接的例子：
select RBCO~BELNR RBCO~BNKAN_FW RBCO~BUZEI RBCO~GJAHR RBCO~GSBER RBCO~SHKZG RBCO~WRBTR RSEG~BELNR RSEG~BUZEI RSEG~EBELN RSEG~EBELP
RSEG~GJAHR RBKP~BELNR RBKP~GJAHR EKPO~BANFN EKPO~BNFPO EKPO~EBELN EKPO~EBELP EKPO~TXZ01 EKKO~EBELN EKKO~EKGRP EKKO~LIFNR
EKKN~AEDAT EKKN~AUFNR EKKN~EBELN EKKN~EBELP EKKN~KOSTL AFVC~APLZL AFVC~AUFPL AFVC~BANFN AFVC~BNFPO LFBK~BANKL LFBK~BANKN
LFBK~BANKS LFBK~BKONT LFBK~LIFNR AUFK~AUART AUFK~AUFNR AUFK~KOKRS AUFK~KTEXT AUFK~ZZEND_DT AUFK~ZZST_DT AUFK~ZZSYUNKOU
OPROL~APLZL OPROL~AUFPL OPROL~OBKNR OPROL~OBZAE AFIH~ARTPR AFIH~AUFNR AFIH~ILOAN AFIH~PRIOK BNKA~BANKA BNKA~BANKL BNKA~BANKS
BNKA~BRNCH ILOA~ILOAN ILOA~TPLNR LFA1~LIFNR LFA1~NAME1 QMIH~BAUTL QMIH~ILOAN
into (RBCO-BELNR , RBCO-BNKAN_FW , RBCO-BUZEI , RBCO-GJAHR , RBCO-GSBER , RBCO-SHKZG , RBCO-WRBTR , RSEG-BELNR , RSEG-BUZEI, RSEG-EBELN , RSEG-EBELP , RSEG-GJAHR , RBKP-BELNR , RBKP-GJAHR , EKPO-BANFN , EKPO-BNFPO , EKPO-EBELN , EKPO-EBELP, EKPO-TXZ01 , EKKO-EBELN , EKKO-EKGRP , EKKO-LIFNR , EKKN-AEDAT , EKKN-AUFNR , EKKN-EBELN , EKKN-EBELP , EKKN-KOSTL, AFVC-APLZL , AFVC-AUFPL , AFVC-BANFN , AFVC-BNFPO , LFBK-BANKL , LFBK-BANKN , LFBK-BANKS , LFBK-BKONT , LFBK-LIFNR, AUFK-AUART , AUFK-AUFNR , AUFK-KOKRS , AUFK-KTEXT , AUFK-ZZEND_DT , AUFK-ZZST_DT , AUFK-ZZSYUNKOU , OPROL-APLZL, OPROL-AUFPL , OPROL-OBKNR , OPROL-OBZAE , AFIH-ARTPR , AFIH-AUFNR , AFIH-ILOAN , AFIH-PRIOK , BNKA-BANKA , BNKA-BANKL, BNKA-BANKS , BNKA-BRNCH , ILOA-ILOAN , ILOA-TPLNR , LFA1-LIFNR , LFA1-NAME1 , QMIH-BAUTL , QMIH-ILOAN )
from ( RBCO
inner join RSEG
on RSEG~BELNR = RBCO~BELNR
and RSEG~BUZEI = RBCO~BUZEI
and RSEG~GJAHR = RBCO~GJAHR
inner join RBKP
on RBKP~BELNR = RSEG~BELNR
and RBKP~GJAHR = RSEG~GJAHR
inner join EKPO
on EKPO~EBELN = RSEG~EBELN
and EKPO~EBELP = RSEG~EBELP
inner join EKKO
on EKKO~EBELN = EKPO~EBELN
inner join EKKN
on EKKN~EBELN = EKPO~EBELN
and EKKN~EBELP = EKPO~EBELP
inner join AFVC
on AFVC~BANFN = EKPO~BANFN
and AFVC~BNFPO = EKPO~BNFPO
inner join LFBK
on LFBK~LIFNR = EKKO~LIFNR
inner join AUFK
on AUFK~AUFNR = EKKN~AUFNR
left outer join OPROL
on OPROL~APLZL = AFVC~APLZL
and OPROL~AUFPL = AFVC~AUFPL
inner join AFIH
on AFIH~AUFNR = AUFK~AUFNR
inner join BNKA
on BNKA~BANKL = LFBK~BANKL
and BNKA~BANKS = LFBK~BANKS
inner join ILOA
on ILOA~ILOAN = AFIH~ILOAN
inner join LFA1
on LFA1~LIFNR = LFBK~LIFNR
left outer join QMIH
on QMIH~ILOAN = ILOA~ILOAN )
where RBCO~GJAHR in GJAHR
and EKKO~EKGRP in KOBAIGRP
and AUFK~AUFNR in SASHIZU
and AUFK~ZZSYUNKOU in SYUNKOU
and AUFK~ZZST_DT in YOUTEIBI
and ILOA~TPLNR in KINOUBAS.
for all entries。。。
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