common-table-expression

问题 I have written a CTE query and I am executing the query in Microsoft SQL Server 2008 R2 Management Studio: WITH DependencyHierarchy(processName, dependProcessName) AS ( SELECT processName, dependProcessName, 1 as HierarchyLevel FROM processDependency UNION ALL SELECT e.processName, e.dependProcessName, eh.HierarchyLevel + 1 AS HierarchyLevel FROM processDependency e INNER JOIN DependencyHierarchy eh ON e.dependProcessName = eh.processName ) SELECT * FROM DependencyHierarchy ORDER BY

问题 I have a very specific problem in T-SQL. If I can solve this example case I give you I think I will be able to solve my original case. Having this data in a table: DECLARE @Test TABLE ( Value INT ,Date DATETIME2(7) ); INSERT INTO @Test VALUES (NULL, '2011-01-01 10:00'), (NULL, '2011-01-01 11:00'), (2, '2011-01-01 12:00'), (NULL, '2011-01-01 13:00'), (3, '2011-01-01 14:00'), (NULL, '2011-01-01 15:00'), (NULL, '2011-01-01 16:00'), (4, '2011-01-01 17:00'), (NULL, '2011-01-01 18:00'), (5, '2011

问题 I want to generate a range of days between two different dates using recursive WITH clause in Oracle. WITH CTE_Dates (cte_date) AS ( SELECT CAST(TO_DATE('10-02-2017', 'DD-MM-YYYY') AS DATE) cte_date FROM dual UNION ALL SELECT CAST( (cte_date + 1) AS DATE) cte_date FROM CTE_Dates WHERE TRUNC(cte_date) + 1 <= TO_DATE('20-02-2017', 'DD-MM-YYYY') ) SELECT * FROM CTE_Dates The returned results are completely other than expected: 10-02-2017 09-02-2017 08-02-2017 07-02-2017 06-02-2017 ... (unlimited

问题 I'm using PostgreSQL 9.1.6 and trying to build recursive SQL. I want to sort like ORDER SIBLINGS BY in SQL-Server does it. Editor's note: This is probably supposed to refer to Oracle , where ORDER SIBLINGS BY actually exists. Test table: create table RECURSIVE_TEST( EMP_ID int, MANAGER_ID int, EMP_NAME varchar(30) ); insert into recursive_test values (1 ,0 ,'MANAGER1'), (2 ,0 ,'MANAGER2'), (3 ,0 ,'MANAGER3'), (4 ,0 ,'MANAGER4'), (5 ,1 ,'emp1'), (6 ,3 ,'emp2'), (7 ,4 ,'emp3'), (8 ,2 ,'emp4'),

问题 ALTER PROCEDURE SP_PriceUpdate -- Add the parameters for the stored procedure here @PriceRuleID INT = NULL, @CategoryID INT = NULL, @SiteID INT = NULL AS SET NOCOUNT ON; BEGIN WITH PriceCTE(ProductID, CategoryID, SalePrice) AS ( SELECT ProductID, CategoryID, SalePrice FROM CAT_Products WHERE CategoryID = @CategoryID ) SELECT ProductID,categoryID,SalePrice FROM PriceCTE DECLARE @Value DECIMAL(32,2), @Type NVARCHAR(5), @Inc_Dec NVARCHAR(5) SELECT @Value = value FROM VB_PriceRule WHERE ID =

问题 am running PostgreSQL 9.2 . below given is a sample of my huge and ugly query with cte as( select ....... from aTable ),cte1 as ( select ..... from bTable inner join cte using(anID) ),update_cte as( update cte set aField=(select somthing from cte1) ) select * from cte i need to create a view with the final result . while executing the above am getting an error which is below. ERROR: relation "cte" does not exist I know am doing something bad. hope you can understand what am trying to achieve

问题 Just interested, why below ( simplified ) example works this way. CREATE TABLE test (id SERIAL, val INT NOT NULL, PRIMARY KEY(id)); INSERT INTO test (val) VALUES (1); WITH t AS ( UPDATE test SET val = 1 RETURNING id ) DELETE FROM test WHERE id IN ( SELECT id FROM t); Result: DELETE 0 Question: Why DELETE did not find any rows to delete? PostgreSql version 9.2.1 Transaction isolation = read commited Thanks! 回答1: I suspect it has something to do with this line in the docs - The primary query

问题 When using multiple CTE's in MSSQL 2008, I normally separate them with a comma. But when I try this in a Teradata environment, I get an error with the syntax. Works in MS SQL: WITH CTE1 AS (SELECT TOP 2 Name FROM Sales.Store) ,CTE2 AS (SELECT TOP 2 ProductNumber, Name FROM Production.Product) ,CTE3 AS (SELECT TOP 2 Name FROM Person.ContactType) SELECT * FROM CTE1,CTE2,CTE3 Now, attempting to put into Teradata syntax: WITH RECURSIVE CTE1 (Name) AS (SELECT TOP 2 Name FROM Sales.Store)

问题 I have many similar structure tables like this: CREATE TABLE [dbo].[tbl_Hierarchy]( [ID] [int] NOT NULL, [ParentID] [int] NOT NULL, [Text] [nvarchar](100) NOT NULL, --other field irrelevant to my question ) INSERT INTO dbo.tbl_Hierarchy VALUES(1,0,'parent1') INSERT INTO dbo.tbl_Hierarchy VALUES(2,0,'parent2') INSERT INTO tbl_Hierarchy VALUES(3,1,'child1') INSERT INTO tbl_Hierarchy VALUES(4,3,'grandchild1') INSERT INTO tbl_Hierarchy VALUES(5,2,'child2') Can you help me writing such as a stored

问题 I have a table which stores company information and their parent company in a regular hierarchical manner, with companyid, parentid and name. I just learn CTE query in Sql Server and write this query WITH tableR (ParentCompanyID, CompanyID, Levels) AS ( -- Anchor member definition SELECT e.ParentCompanyID, e.CompanyID, 0 As Levels FROM tblCompany AS e WHERE ParentCompanyID in (9) UNION ALL -- Recursive member definition SELECT e.ParentCompanyID, e.CompanyID, Levels + 1 FROM tblCompany AS e