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    Updating deleting predicates oracle

    ALTER TABLE tab1 NO ROW ARCHIVAL; ALTER TABLE tab1 ROW ARCHIVAL; -- Populate the table with 1000 rows.INSERT /* APPEND */ INTO tab1 SELECT level, 'Description of '

    One can, however hardly argue with the fact that the standard SQL version of this update is hard to understand and a lot more to type.

    You can use a correlated subquery to get rid of the duplicates. Three things you need to be aware of when you are using this approach.

    First let me briefly tell you how a correlated subquery works. --Script #2 - Creating a table with duplicate records CREATE TABLE Employee ( [First Name] Varchar(100), [Last Name] Varchar(100), [Address] Varchar(100), ) GO INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Linda', 'Mitchel', 'America') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Linda', 'Mitchel', 'America') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('John', 'Albert', 'Australia') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('John', 'Albert', 'Australia') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('John', 'Albert', 'Australia') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Arshad', 'Ali', 'India') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Arshad', 'Ali', 'India') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Arshad', 'Ali', 'India') INSERT INTO Employee([First Name], [Last Name], [Address]) VALUES ('Arshad', 'Ali', 'India') GO SELECT * FROM Employee GO --Script #3 - Using temporary table BEGIN TRAN -- Pull distinct records in the temporary table SELECT DISTINCT * INTO #Employee FROM Employee --Truncate the target table TRUNCATE TABLE Employee --Insert the distinct records from temporary table --back to target table INSERT INTO Employee SELECT * FROM #Employee --Drop the temporary table IF OBJECT_ID('tempdb..#Employee') IS NOT NULL DROP TABLE #Employee COMMIT TRAN GO SELECT * FROM Employee GO In this approach we create a new table with all distinct records, drop the existing target table and rename the newly created table with the original target table name.

    By using a block predicate you can define rules that identify which rows a database user is not allowed to perform an INSERT, UPDATE, or DELETE operation against.

    The block predicate is defined using the new CREATE SECURITY POLICY statement introduced in SQL Server 2016.

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