Oracle11g 我只需要Oracle sdo_nn更新语句中的一个唯一结果,
从tableB.Field到tableA.Field,我只需要一个唯一的结果 我使用的是sdo运算符sdo_nn,代码如下:Oracle11g 我只需要Oracle sdo_nn更新语句中的一个唯一结果,,oracle11g,geospatial,oracle-spatial,Oracle11g,Geospatial,Oracle Spatial,从tableB.Field到tableA.Field,我只需要一个唯一的结果 我使用的是sdo运算符sdo_nn,代码如下: UPDATE table1 t1 SET t1.fieldA = (SELECT T2.fieldB,SDO_NN_DISTANCE(1) distance FROM table1 T1, table2 T2 WHERE (sdo_nn(t1.geometry,t2.geometry,'SDO_NUM_RES=1',1)= 'TRUE') ORDER BY DIST )
UPDATE table1 t1
SET t1.fieldA = (SELECT T2.fieldB,SDO_NN_DISTANCE(1) distance
FROM table1 T1, table2 T2
WHERE
(sdo_nn(t1.geometry,t2.geometry,'SDO_NUM_RES=1',1)= 'TRUE')
ORDER BY DIST
)
WHERE EXISTS(
SELECT 1
FROM table2 t2
WHERE sdo_nn(t1.geometry, t2.geometry,'SDO_NUM_RES=1',1)='TRUE'
AND(t2.cell_name = 'string1' or t2.cell_name = string2')AND t1.fieldA = NULL
);
在子查询的select语句中,我得到一个错误,因为我只使用了一个字段(t1.fieldA),但在该语句中,我使用了运算符SDO\u NN\u DISTANCE(1),sql开发人员将该运算符与另一个字段一样计数。写这个句子的正确方法是什么?我只使用sql,因为我需要在vba中插入此代码
谢谢 显然,你不能(简化)
因此,从子查询中单独获取fieldB
,该子查询使用分析函数(row\u number
)按sdo\u nn\u距离(1)desc对行进行“排序”;然后获取第一行的字段b
值
类似这样的内容(我希望我设置了正确的括号):
set t1.fieldA = (t2.fieldB, distance) --> you want to put two values into a single column
UPDATE table1 t1
SET t1.fieldA =
(SELECT x.fieldB --> only fieldB
FROM (SELECT T2.fieldB, --> from your subquery
SDO_NN_DISTANCE (1) distance,
ROW_NUMBER ()
OVER (ORDER BY sdo_nn_distance (1) DESC) rn
FROM table1 T1, table2 T2
WHERE (sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE')) x
WHERE rn = 1) --> where RN = 1
WHERE EXISTS
(SELECT 1
FROM table2 t2
WHERE sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE'
AND ( t2.cell_name = 'string1'
OR t2.cell_name = 'string2')
AND t1.fieldA IS NULL);