MERGE
Update rows while using JOIN conditions:
MERGE Flashcards AS target
USING (
SELECT DISTINCT r.FlashcardsId, r.CategoryId
FROM Schedule s, RelCategoryFlashcards r, Categories c
WHERE s.FlashcardId = r.FlashcardId
AND c.Flag = 1
AND r.CategoryId = c.Id) AS source
ON target.ID = source.ID
WHEN MATCHED THEN
UPDATE SET target.NextDate = SYSDATE()
WHEN NOT MATCHED BY source AND target.CatgeoryId = 1
THEN DELETE;
MERGE Absenz absenz
USING (
SELECT kak.ID IdKontakt, a.Id IdAbsenz FROM Kunde k
JOIN Mitarbeiter m on m.IDKunde = k.ID
JOIN Absenz a on a.IDArbeitnehmer = ka.ID) kunde
ON absenz.ID = k.IdAbsenz
WHEN MATCHED THEN
UPDATE SET absenz.IDArbeitgeber = kunde.IdKontakt;
Views
DROP VIEW IF EXISTS dbo.KontaktSuche
GO
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id('dbo.KontaktSuche') AND OBJECTPROPERTY(id, 'IsView') = 1)
DROP VIEW dbo.KontaktSuche
GO
Show table space usage
This is from a StackOverflow:https://stackoverflow.com/a/7892349/513292
SELECT
t.NAME AS TableName,
s.Name AS SchemaName,
p.rows,
SUM(a.total_pages) * 8 AS TotalSpaceKB,
CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB,
(SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB,
CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) AS UnusedSpaceMB
FROM
sys.tables t
INNER JOIN
sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
sys.allocation_units a ON p.partition_id = a.container_id
LEFT OUTER JOIN
sys.schemas s ON t.schema_id = s.schema_id
WHERE
t.NAME NOT LIKE 'dt%'
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255
GROUP BY
t.Name, s.Name, p.Rows
ORDER BY
TotalSpaceMB DESC, t.Name