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select @@version;
| (No column name) |
|---|
| Microsoft SQL Server 2019 (RTM-CU16) (KB5011644) - 15.0.4223.1 (X64) Apr 11 2022 16:24:07 Copyright (C) 2019 Microsoft Corporation Express Edition (64-bit) on Windows Server 2019 Standard 10.0 <X64> (Build 17763: ) (Hypervisor) |
CREATE TABLE DMZ
(
DDM date NOT NULL,
NDM int NOT NULL,
PR int NOT NULL
CONSTRAINT PK_DMZ PRIMARY KEY(NDM)
);
ALTER TABLE DMZ
ADD CONSTRAINT PR CHECK (PR IN (1,2));
INSERT INTO DMZ VALUES('2014.01.04', 20, 1);
INSERT INTO DMZ VALUES('2014.01.04', 21, 1);
INSERT INTO DMZ VALUES('2014.01.04', 22, 2);
INSERT INTO DMZ VALUES('2014.01.04', 23, 1);
INSERT INTO DMZ VALUES('2014.01.04', 24, 1);
INSERT INTO DMZ VALUES('2014.01.04', 25, 2);
INSERT INTO DMZ VALUES('2014.01.04', 26, 2);
7 rows affected
SELECT * FROM DMZ
| DDM | NDM | PR |
|---|---|---|
| 2014-01-04 | 20 | 1 |
| 2014-01-04 | 21 | 1 |
| 2014-01-04 | 22 | 2 |
| 2014-01-04 | 23 | 1 |
| 2014-01-04 | 24 | 1 |
| 2014-01-04 | 25 | 2 |
| 2014-01-04 | 26 | 2 |
INSERT INTO DMZ (a.DDM, a.NDM, a.PR)
SELECT GETDATE() AS DOM,
a.NDM AS NDM,
CASE WHEN a.PR_1_Count > a.PR_2_Count
THEN 2
ELSE 1
END AS PR
FROM (SELECT
MAX(NDM) + 1 AS NDM,
SUM(CASE WHEN PR = 1 THEN 1 ELSE 0 END) AS PR_1_Count,
SUM(CASE WHEN PR = 2 THEN 1 ELSE 0 END) AS PR_2_Count
FROM DMZ) a
1 rows affected
SELECT * FROM DMZ
| DDM | NDM | PR |
|---|---|---|
| 2014-01-04 | 20 | 1 |
| 2014-01-04 | 21 | 1 |
| 2014-01-04 | 22 | 2 |
| 2014-01-04 | 23 | 1 |
| 2014-01-04 | 24 | 1 |
| 2014-01-04 | 25 | 2 |
| 2014-01-04 | 26 | 2 |
| 2022-10-19 | 27 | 2 |
ALTER TABLE DMZ
ADD NDM_NEW INT IDENTITY(1, 1)
ALTER TABLE DMZ
DROP CONSTRAINT PK_DMZ
ALTER TABLE DMZ DROP COLUMN NDM
SELECT * FROM DMZ
| DDM | PR | NDM_NEW |
|---|---|---|
| 2014-01-04 | 1 | 1 |
| 2014-01-04 | 1 | 2 |
| 2014-01-04 | 2 | 3 |
| 2014-01-04 | 1 | 4 |
| 2014-01-04 | 1 | 5 |
| 2014-01-04 | 2 | 6 |
| 2014-01-04 | 2 | 7 |
| 2022-10-19 | 2 | 8 |
EXEC sp_rename 'DMZ.NDM_NEW', 'NDM', 'COLUMN'
Caution: Changing any part of an object name could break scripts and stored procedures.
ALTER TABLE DMZ
ADD CONSTRAINT PK_DMZ PRIMARY KEY(NDM)
SELECT * FROM DMZ
| DDM | PR | NDM |
|---|---|---|
| 2014-01-04 | 1 | 1 |
| 2014-01-04 | 1 | 2 |
| 2014-01-04 | 2 | 3 |
| 2014-01-04 | 1 | 4 |
| 2014-01-04 | 1 | 5 |
| 2014-01-04 | 2 | 6 |
| 2014-01-04 | 2 | 7 |
| 2022-10-19 | 2 | 8 |
INSERT INTO DMZ (a.DDM, a.PR)
SELECT GETDATE() AS DOM,
CASE WHEN a.PR_1_Count > a.PR_2_Count
THEN 2
ELSE 1
END AS PR
FROM (SELECT
SUM(CASE WHEN PR = 1 THEN 1 ELSE 0 END) AS PR_1_Count,
SUM(CASE WHEN PR = 2 THEN 1 ELSE 0 END) AS PR_2_Count
FROM DMZ) a
1 rows affected
SELECT * FROM DMZ
| DDM | PR | NDM |
|---|---|---|
| 2014-01-04 | 1 | 1 |
| 2014-01-04 | 1 | 2 |
| 2014-01-04 | 2 | 3 |
| 2014-01-04 | 1 | 4 |
| 2014-01-04 | 1 | 5 |
| 2014-01-04 | 2 | 6 |
| 2014-01-04 | 2 | 7 |
| 2022-10-19 | 2 | 8 |
| 2022-10-19 | 1 | 9 |