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Posted by / 29-Jan-2018 23:51

Oracle updating large tables

SQL CREATE or replace PROCEDURE Update Department 2 (Dept ID IN integer, 3 Department Name IN varchar2, 4 Department Description IN varchar2) 5 6 AS 7 BEGIN 8 UPDATE Department 9 SET Name = Department Name, 10 Description = Department Description 11 WHERE Department ID = Dept ID; 12 END; 13 / Procedure created.In SQL Server 2008, you can perform multiple data manipulation language (DML) operations in a single statement by using the MERGE statement.i have to insert/update/delete from s1 to d1 on daily basis. CREATE OR REPLACE TRIGGER Department Autonumber Trigger 2 BEFORE INSERT ON Department 3 FOR EACH ROW 4 BEGIN 5 SELECT Department IDSeq. Department ID FROM DUAL; 7 END; 8 / Trigger created.

For example, in the following MERGE statement the source table, MERGE dbo. We recommend that you do not use the hash join as a query hint for MERGE statements because this join type does not use indexes. The query optimizer does not apply the simple parameterization process to MERGE statements.The TOP clause further reduces the number of joined rows to the specified value and the insert, update, or delete actions are applied to the remaining joined rows in an unordered fashion.That is, there is no order in which the rows are distributed among the actions defined in the WHEN clauses.For example, you may need to synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other table.Typically, this is done by executing a stored procedure or batch that contains individual INSERT, UPDATE, and DELETE statements.

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Consider another table STUDENT_N, which holds updates for the target table STUDENT.