我正在运行 Oracle Database 11g Enterprise 11.2.0.4.0、PL/SQL Release 11.2.0.4.0,并且在获取 LISTAGG 函数返回我期望的数据集时遇到一些问题。
这是场景:
我有一个看起来像这样的数据集
我想在一行的一列中返回 MOD_CODE 列中的值,例如:
AR4001,AR4002
我一直在尝试使用 LISTAGG 函数来完成此操作,例如:
SELECT LISTAGG(MOD_CODE,',') WITHIN GROUP (ORDER BY MOD_CODE)
FROM XOTEST_A
WHERE MOD_CODE IN ('AR4001','AR4002')
但它没有返回任何数据(见截图)
我究竟做错了什么?这是更广泛场景的一部分,所以我理想地希望使用 LISTAGG 或类似的(我尝试使用 wm_concat 函数,但它返回 HUGECLOB 数据类型并且也不起作用)
我已经编写了 SQL 来构建重现场景
-- CREATE TABLE
CREATE TABLE XOTEST_A (
MOD_CODE NVARCHAR2(12),
DOM_CODE NVARCHAR2(12),
MOD_SNAM NVARCHAR2(15),
MOD_NAME NVARCHAR2(120),
SCH_CODE NVARCHAR2(6),
LEV_CODE NVARCHAR2(6),
PRS_CODE NVARCHAR2(12),
MOT_CODE NVARCHAR2(6),
MOD_CRDT NUMBER(5,2),
MOD_HOURS NUMBER(4),
MAP_CODE NVARCHAR2(12),
MOD_EREF NVARCHAR2(12),
MKS_CODE NVARCHAR2(6),
FPT_CODE NVARCHAR2(12),
ESB_CODE NVARCHAR2(6),
MOD_NPER NUMBER(2),
MOD_MOAS NVARCHAR2(1),
MOD_PMOA NVARCHAR2(1),
MEP_CODE NVARCHAR2(6),
DPT_CODE NVARCHAR2(12),
ELV_CODE NVARCHAR2(3),
ECL_CODE NVARCHAR2(3),
MOD_UTYC NVARCHAR2(3),
MOD_COGC NVARCHAR2(6),
MOD_STAT VARCHAR2(1 BYTE),
MOD_UPDD DATE,
MOD_KEYW NVARCHAR2(100),
MOD_IUSE VARCHAR2(1 BYTE),
MOD_TOCC NVARCHAR2(12),
MOD_DVNC NVARCHAR2(12),
MOD_UDF1 NVARCHAR2(15),
MOD_UDF2 NVARCHAR2(15),
MOD_UDF3 NVARCHAR2(15),
MOD_UDF4 NVARCHAR2(15),
MOD_UDF5 NVARCHAR2(15),
MOD_UDF6 NVARCHAR2(15),
MOD_UDF7 NVARCHAR2(15),
MOD_UDF8 NVARCHAR2(15),
MOD_UDF9 NVARCHAR2(15),
MOD_UDFA NVARCHAR2(15),
MOD_UDFB NVARCHAR2(15),
MOD_UDFC NVARCHAR2(15),
MOD_UDFD NVARCHAR2(15),
MOD_UDFE NVARCHAR2(15),
MOD_UDFF NVARCHAR2(15),
MOD_UDFG NVARCHAR2(15),
MOD_UDFH NVARCHAR2(15),
MOD_UDFI NVARCHAR2(15),
MOD_UDFJ NVARCHAR2(100),
MOD_UDFK NVARCHAR2(100),
MOD_VALC NVARCHAR2(12),
MOD_APRT NUMBER(5,2),
MOD_LANG NVARCHAR2(1),
MOD_ERFM NVARCHAR2(1),
MOD_MUSE VARCHAR2(1 BYTE),
MOD_FACC NVARCHAR2(6),
MOD_ISGX VARCHAR2(1 BYTE),
MOD_REGM NVARCHAR2(1),
MOD_FRID VARCHAR2(1 BYTE),
MOD_WEEI NVARCHAR2(1),
MOD_MODE NVARCHAR2(1)--,
--MOD_NOTE NCLOB
)
--INSERT VALUES INTO THE TABLE
INSERT INTO XOTEST_A (MOD_CODE,DOM_CODE,MOD_SNAM,MOD_NAME,SCH_CODE,LEV_CODE,PRS_CODE,MOT_CODE,MOD_CRDT,MOD_HOURS,MAP_CODE,MOD_EREF,MKS_CODE,FPT_CODE,ESB_CODE,MOD_NPER,MOD_MOAS,MOD_PMOA,MEP_CODE,DPT_CODE,ELV_CODE,ECL_CODE,MOD_UTYC,MOD_COGC,MOD_STAT,MOD_UPDD,MOD_KEYW,MOD_IUSE,MOD_TOCC,MOD_DVNC,MOD_UDF1,MOD_UDF2,MOD_UDF3,MOD_UDF4,MOD_UDF5,MOD_UDF6,MOD_UDF7,MOD_UDF8,MOD_UDF9,MOD_UDFA,MOD_UDFB,MOD_UDFC,MOD_UDFD,MOD_UDFE,MOD_UDFF,MOD_UDFG,MOD_UDFH,MOD_UDFI,MOD_UDFJ,MOD_UDFK,MOD_VALC,MOD_APRT,MOD_LANG,MOD_ERFM,MOD_MUSE,MOD_FACC,MOD_ISGX,MOD_REGM,MOD_FRID,MOD_WEEI,MOD_MODE/*,MOD_NOTE*/)
VALUES ('AR4001', 'SEN', 'AR4001', 'DESIGN STUDIO 1A', 'UL', '1', 'HASGRA1', 'A', 15, NULL, 'AR4001', NULL, 'AMOD', NULL, NULL, 1, 'M', 'M', NULL, 'SENDES', NULL, NULL, 'F', NULL, NULL, NULL, NULL, 'Y', NULL, NULL, NULL, '15/05/2008', 'V', 'P', NULL, 'N', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 'N', NULL, NULL, NULL, NULL, NULL, NULL/*, ''*/)
COMMIT;
INSERT INTO XOTEST_A (MOD_CODE,DOM_CODE,MOD_SNAM,MOD_NAME,SCH_CODE,LEV_CODE,PRS_CODE,MOT_CODE,MOD_CRDT,MOD_HOURS,MAP_CODE,MOD_EREF,MKS_CODE,FPT_CODE,ESB_CODE,MOD_NPER,MOD_MOAS,MOD_PMOA,MEP_CODE,DPT_CODE,ELV_CODE,ECL_CODE,MOD_UTYC,MOD_COGC,MOD_STAT,MOD_UPDD,MOD_KEYW,MOD_IUSE,MOD_TOCC,MOD_DVNC,MOD_UDF1,MOD_UDF2,MOD_UDF3,MOD_UDF4,MOD_UDF5,MOD_UDF6,MOD_UDF7,MOD_UDF8,MOD_UDF9,MOD_UDFA,MOD_UDFB,MOD_UDFC,MOD_UDFD,MOD_UDFE,MOD_UDFF,MOD_UDFG,MOD_UDFH,MOD_UDFI,MOD_UDFJ,MOD_UDFK,MOD_VALC,MOD_APRT,MOD_LANG,MOD_ERFM,MOD_MUSE,MOD_FACC,MOD_ISGX,MOD_REGM,MOD_FRID,MOD_WEEI,MOD_MODE/*,MOD_NOTE*/)
VALUES ('AR4002', 'SEN', 'AR4002', 'DESIGN STUDIO 1A', 'UL', '1', 'HASGRA1', 'A', 15, NULL, 'AR4002', NULL, 'AMOD', NULL, NULL, 1, 'M', 'M', NULL, 'SENDES', NULL, NULL, 'F', NULL, NULL, NULL, NULL, 'Y', NULL, NULL, NULL, '15/05/2008', 'V', 'P', NULL, 'N', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 'N', NULL, NULL, NULL, NULL, NULL, NULL/*, ''*/)
COMMIT;
-- NOW RUN THE SELECT STATEMENT
SELECT LISTAGG(MOD_CODE,',') WITHIN GROUP (ORDER BY MOD_CODE) LISTAGG_OUTPUT
FROM XOTEST_A
WHERE MOD_CODE IN ('AR4001','AR4002')