如何转换这个PL / SQL更新语句,以便在SQL Server的作品?
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22-07-2019 - |
题
我一直在问这个说法从PL / SQL转换到SQL Server:
UPDATE pdi_nb_process_complete pdi_end1
SET (pdi_end1.adp_issue_date_time, pdi_end1.adp_print_date_time) =
(SELECT DISTINCT pdi_end1.completion_date + 2
,pdi_end1.completion_date
FROM cl100 cl
WHERE cl.polref = pdi_end1.policy_reference
AND cl.doctyp = 'PSP')
WHERE pdi_end1.adp_print_date_time IS NULL
一个直复制/粘贴不工作 - 你得到一个编译错误。我已设法最接近是这样的:
UPDATE pdi_end1
SET pdi_end1.adp_issue_date_time = pdi_end1.completion_date + 2,
pdi_end1.adp_print_date_time = pdi_end1.completion_date
from pdi_nb_process pdi_end1
INNER JOIN cl100 cl ON cl.polref = pdi_end1.policy_reference
AND cl.doctyp = 'PSP'
WHERE pdi_end1.adp_print_date_time IS NULL
但是,这给我留下很短的 DISTINCT的。有没有人有什么建议吗?
您可以假设Oracle和SQL Server数据库具有相同的表和字段。
由于
解决方案
我会移动 AND cl.doctyp = 'PSP'的条件的WHERE,因为它不是一个连接条件。
尝试这样:
UPDATE pdi_end1
SET pdi_end1.adp_issue_date_time=pdi_end1.completion_date + 2
,pdi_end1.adp_print_date_time)=pdi_end1.completion_date
FROM pdi_nb_process_complete pdi_endl
INNER JOIN cl100 cl ON cl.polref=pdi_end1.policy_reference
WHERE pdi_end1.adp_print_date_time IS NULL
AND cl.doctyp='PSP'
我就不会担心了DISTINCT,SQL Server将只更新行一次,看到这样的例子:
SET NOCOUNT ON
DECLARE @Test table (RowID int, RowValue int, OtherRowValue int)
INSERT INTO @Test VALUES ( 1, 1, 10)
INSERT INTO @Test VALUES ( 2, 2, 20)
INSERT INTO @Test VALUES ( 3, 3, 30)
INSERT INTO @Test VALUES ( 4, 4, 40)
INSERT INTO @Test VALUES ( 5, 5, 50)
INSERT INTO @Test VALUES ( 6, 6, 60)
INSERT INTO @Test VALUES ( 7, 7, 70)
INSERT INTO @Test VALUES ( 8, 8, 80)
INSERT INTO @Test VALUES ( 9, 9, 90)
INSERT INTO @Test VALUES (10,10,100)
DECLARE @TestJoin table (RowID int, RowValue int)
INSERT INTO @TestJoin VALUES (1,10)
INSERT INTO @TestJoin VALUES (1,10)
INSERT INTO @TestJoin VALUES (1,10)
INSERT INTO @TestJoin VALUES (2,20)
INSERT INTO @TestJoin VALUES (2,20)
INSERT INTO @TestJoin VALUES (2,20)
INSERT INTO @TestJoin VALUES (2,20)
INSERT INTO @TestJoin VALUES (2,20)
INSERT INTO @TestJoin VALUES (3,30)
INSERT INTO @TestJoin VALUES (3,30)
SET NOCOUNT OFF
SELECT ---------------------------returns 5 rows, DISTINCT would only return 1
t.OtherRowValue+2
FROM @Test t
INNER JOIN @TestJoin j ON t.RowID=j.RowID
WHERE t.OtherRowValue=20
AND j.RowValue=20
UPDATE t--------------------------updates only 1 row
SET t.RowValue=t.OtherRowValue+2
FROM @Test t
INNER JOIN @TestJoin j ON t.RowID=j.RowID
WHERE t.OtherRowValue=20
AND j.RowValue=20
输出:
-----------
22
22
22
22
22
(5 row(s) affected)
(1 row(s) affected)
在SELECT返回5行,然而,当同样的选择被放入UPDATE,只有1行受到影响。
其他提示
您可以改变内连接到一个子查询:
inner join (
select distinct policy_reference
from cl100
where doctyp = 'PSP'
) cl on cl.polref = pdi_end1.policy_reference
或者,也许更加可读,取下内加入共并用WHERE语句替换:
WHERE pdi_end1.adp_print_date_time IS NULL
AND EXISTS (
select *
from cl100 cl
where cl.polref = pdi_end1.policy_reference
and cl.doctyp = 'PSP'
)
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