问下存储过程里的这段代码啥意思
update 资产负债表 set 现金及现金等价物 = b.金额 from 资产负债表 as a,
(select sum(isnull(本期借方余额,0)-isnull(本期贷方余额,0)) as 金额
from 科目余额表 where 会计期间 = @kjqj and
科目代码 > = 101 and 科目代码 <= 111)
as b where a.会计期间 = @kjqj

[解决办法]
update a
set 现金及现金等价物 = b.金额
from 资产负债表 as a,
(select sum(isnull(本期借方余额,0)-isnull(本期贷方余额,0)) as 金额
from 科目余额表
where 会计期间 = @kjqj and 科目代码 between 101 and 111) as b
where a.会计期间 = @kjqj
[解决办法]
拆分:
1.update 资产负债表 set 现金及现金等价物 = b.金额 from 资产负债表 as a,[$select..$] as b where a.会计期间 = @kjqj

2.[$select..$]::=
(select sum(isnull(本期借方余额,0)-isnull(本期贷方余额,0)) as 金额
from 科目余额表 where 会计期间 = @kjqj and
科目代码 > = 101 and 科目代码 <= 111)