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Drpping primary key constraint - Ask TOM - Oracle?

Drpping primary key constraint - Ask TOM - Oracle?

WebDec 11, 2014 · Results. -- DROP and CREATE Table 'IndexTest'. Scan count 3, logical reads 1566, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. SQL Server Execution Times: CPU time = 218 ms, elapsed time = 194 ms. -- ALTER INDEX REBUILD Table 'IndexTest'. WebProblem: You want to drop a primary key from a table in a database. Example: We want to remove the primary key from the table product. Solution 1: ALTER TABLE product DROP PRIMARY KEY; Discussion: To drop a primary key from a table, use an ALTER TABLE clause with the name of the table (in our example, product) followed by the clause DROP … 23 mansfield road scunthorpe WebFor example, you can drop the primary key constraint of the vendors table as follows: ALTER TABLE vendors DROP CONSTRAINT pk_vendors; Code language: SQL … WebTo drop an index, the index must be contained in your schema, or you must have the DROP ANY INDEX system privilege. Some reasons for dropping an index include: The index is no longer required. The index is not providing anticipated performance improvements for queries issued against the associated table. For example, the table … bounce perth WebApr 22, 2024 · 2. Drop Unique Index. You have to know the name of the primary key in order to drop it. SQL> drop index hr.JHIST_EMP_ID_ST_DATE_PK; Index dropped. … WebThe drop primary key function generates the appropriate alter table drop primary key SQL command for dropping the key from the table. Listed below is an example of the SQL … 23 mansfield road reading WebPrimary and unique keys automatically have indexes, but you might want to create an index on a foreign key; see Chapter 3, "Maintaining Data Integrity Through Constraints" for more information. Small tables do not require indexes; if a query is taking too long, then the table might have grown from small to large.

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