Question

我有一个表的父类和子类。我已经能够编写合并查询以在输出表中插入唯一类别。但是我在如何用父母替换孩子的cat_id以使他们与他们联系时遇到困难。

CREATE TABLE import_desctemp(
   TempID INT  NOT NULL PRIMARY KEY 
  ,Main   nvarchar(10) NOT NULL
  ,Sub1   nvarchar(10)
  ,Sub2   nvarchar(10)
  ,cst    INT 
);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (TempID,'Main','Sub1','Sub2',cst);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (1,'Commercial','Bathroom',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (2,'Commercial','Kitchen','Pantry',NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (3,'Commercial','Kitchen','Pantry',NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (4,'Commercial','Rumpus',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (5,'Commercial','Rumpus',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (6,'Commercial',NULL,NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (7,'Commercial',NULL,NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (8,'Commercial',NULL,NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (9,'Domestic','Bathroom','Toilet',NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (10,'Domestic','Bathroom','Toilet',NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (11,'Domestic','Bathroom','Toilet',NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (12,'Domestic','Bathroom',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (13,'Domestic','Kitchen',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (14,'Domestic','Kitchen',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (15,'Domestic','Laundry',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (16,'Domestic','Laundry',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (17,'Domestic','Laundry',NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (18,'Domestic',NULL,NULL,NULL);
INSERT INTO import_desctemp(TempID,Main,Sub1,Sub2,cst) VALUES (19,'Domestic',NULL,NULL,NULL);


CREATE TABLE Description_Category(
   CSD_ID         INT NOT NULL PRIMARY KEY
  ,Category       nvarchar(10)
  ,Parent_ID      INT
  ,Primary_cat_id INT
);
INSERT INTO Description_Category(CSD_ID,Category,Parent_ID,Primary_cat_id) VALUES (0,NULL,NULL,NULL);

这是我写的代码。它可以将 import_desctemp 表中的类别插入 Description_Category 只是在将正确的ID插入Primary_cat_ID时遇到问题，以便它引用Parent类。

--ALTER TABLE import_desctemp ADD CST int

DECLARE @MergeOutput1 table
(
  ActionType NVARCHAR(10),
  csd INT,
  cat nvarchar(10))

MERGE Description_Category AS C
USING  (
SELECT Main -- Do a group by to eliminate duplicates
FROM import_desctemp I
WHERE Main IS NOT null
GROUP BY Main
) AS SRC
ON (1=0)
WHEN NOT MATCHED BY TARGET THEN
-- Insert Categories from excel table to live table
INSERT (category)
VALUES (Main)

OUTPUT
    $ACTION,
    INSERTED.CSD_ID,
    INSERTED.category
INTO @MergeOutput1;

MERGE Description_Category AS C
USING  (
SELECT DISTINCT Main, Sub1
FROM import_desctemp
WHERE sub1 is not null
GROUP BY Main, Sub1
) AS SRC
ON (1=0)
WHEN NOT MATCHED BY TARGET THEN
-- Insert Categories from excel table to live table
INSERT (Category)
VALUES (Sub1)
OUTPUT
    $ACTION,
    INSERTED.CSD_ID,
    INSERTED.Category
INTO @MergeOutput1;

;WITH cte AS (
SELECT t.csd, t.cat--, c.csd_id as cat_id
FROM @MergeOutput1 t 
INNER JOIN import_desctemp c
ON c.Main = t.cat
INNER JOIN import_desctemp c1
ON c1.Sub1 = t.cat
)

UPDATE R
SET primary_Cat_id = c.csd
FROM Description_Category R
INNER JOIN cte c
ON c.csd = R.CSD_ID


/*--Insert primary category IDs from @table into the template category table
update Description_Category
SET Primary_Cat_Id = M.csd
FROM @MergeOutput1 M
JOIN Description_Category O ON O.CSD_ID = M.csd*/

SELECT * FROM @MergeOutput1


/*insert Description_Category (Category)
OUTPUT INSERTED.CSD_ID
select sub1
FROM import_desctemp p
left join @MergeOutput1 m on p.Main = m.cat--LEFT join is important, otherwise may not copy all rows
WHERE p.Sub1 IS NOT NULL*/

/*--Insert cst IDs from @table into the excel table
update import_desctemp
SET CST = M.csd
FROM @MergeOutput1 M
JOIN import_desctemp O ON O.Main = M.Cat
COMMIT;*/
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预期结果

+--------+------------+-----------+----------------+
| TempID |  Category  | Parent_id | Primary_cat_id |
+--------+------------+-----------+----------------+
|      1 | Commercial |         0 |              1 |
|     12 | Domestic   |         0 |             12 |
|     16 | Bathroom   |         1 |              1 |
|     17 | Kitchen    |         1 |              1 |
|     18 | Rumpus     |         1 |              1 |
|     19 | Bathroom   |        12 |             12 |
|     20 | Kitchen    |        12 |             12 |
|     21 | Laundry    |        12 |             12 |
+--------+------------+-----------+----------------+

Answer 1

您需要将表格与我的<>c__DisplayClass1类别（我称之为categories）ID一起加入：

Table

更新：

SELECT c1.pkid, t.sub1, c.pkid
FROM Table t 
INNER JOIN categories c
ON c.category = t.main
INNER JOIN categories c1
ON c1.category = t.sub

存在父键时，SQL Update子项的密钥

1 个答案: