Missing Sequence Number in SQL | Recursive CTE | Generate Sequence Number | SQL Interview Q&A

Publicado el: 16 enero 2021
en el canal de: SQL With RaviMartha

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;WITH Emp_CTE (ID) AS
(
SELECT 1 -- Anchor query
UNION ALL
SELECT ID + 1 FROM Emp_CTE WHERE ID (Lessthansymbol) 14 -- Recursive Query
)
SELECT EC.ID AS Missing_Sequence FROM Emp_CTE EC
LEFT JOIN tblEmployee E
ON EC.ID = E.EmpID
WHERE E.EmpID IS NULL
Option (MAXRECURSION 0) -- MAXRECURSION Query Hint

;WITH Emp_CTE (ID) AS
(
SELECT 1 -- Anchor query
UNION ALL
SELECT ID + 1 FROM Emp_CTE WHERE ID (Lessthansymbol) 14 -- Recursive Query
)
SELECT * FROM Emp_CTE

-- PART 2

CREATE TABLE tblEmployee1 (EmpID INT)

INSERT tblEmployee1 values (51000),(51001),(51004),(51009),(51013),(51017),(51020),(51025),(51026)

SELECT * FROM tblEmployee1

DECLARE @StartID INT, @EndID INT;
SELECT @StartID = MIN(EmpID) FROM tblEmployee1
SELECT @EndID = MAX(EmpID) FROM tblEmployee1

;WITH Emp_CTE (ID) AS
(
SELECT @StartID
UNION ALL
SELECT ID + 1 FROM Emp_CTE WHERE ID (Lessthansymbol) @EndID
)
SELECT EC.ID AS Missing_Sequence FROM Emp_CTE EC
LEFT JOIN tblEmployee1 E
ON EC.ID = E.EmpID
WHERE E.EmpID IS NULL
Option (MAXRECURSION 0)

*/
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