oracle关联更新

update某个表时，如果需要和其他表关联，这样的SQL语句在ORACLE中实现起来比较呕心。各个where条件需要分别与一堆select语句嵌套使用才可，晕~~

以下sql语句是在工作中写出的，做个备忘录：

-- 更新应收账款净额

update t_0303009 t1

set t1.item_value =

(

select t2.item_value

from

(

SELECT a.product_id, a.item_id, b.item_value

FROM (SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%011') a,

(SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%008') b

WHERE a.product_id = b.product_id

AND SUBSTR (a.item_id, 2, 6) = SUBSTR (b.item_id, 2, 6)

AND a.item_value = 0

) t2

where t1.product_id = t2.product_id

and t1.item_id = t2.item_id

)

where t1.product_id = ( select product_id from

(

SELECT a.product_id, a.item_id, b.item_value

FROM (SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%011') a,

(SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%008') b

WHERE a.product_id = b.product_id

AND SUBSTR (a.item_id, 2, 6) = SUBSTR (b.item_id, 2, 6)

AND a.item_value = 0

) jj

where t1.product_id = jj.product_id

and t1.item_id = jj.item_id

)

and t1.item_id = ( select item_id from

(

SELECT a.product_id, a.item_id, b.item_value

FROM (SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%011') a,

(SELECT product_id, item_id, item_value

FROM t_0303009

WHERE item_id LIKE 'B%008') b

WHERE a.product_id = b.product_id

AND SUBSTR (a.item_id, 2, 6) = SUBSTR (b.item_id, 2, 6)

AND a.item_value = 0

) jj2

where t1.product_id = jj2.product_id

and t1.item_id = jj2.item_id

)