Do you need a primary key
WebAlternate keys help you uniquely identify object records, so that you can create, update, delete, and manage relationships. This helps you import and build relationships to other objects, without the need to know the system-generated primary keys of each record. Use of known alternate keys also eliminates the need to requery and remap data. WebOct 18, 2015 · Actually: having a primary key (which by default also is the clustering key) can actually speed up many operations on SQL Server tables - even if the key itself is …
Do you need a primary key
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WebDo you need to use SQL to remove duplicates in your tables? Learn how to write SQL to remove duplicate data, and see the performance, in this article. ... , rowid as "rowid" FROM table WHERE primary_key IN ( SELECT … WebAlternate keys help you uniquely identify object records, so that you can create, update, delete, and manage relationships. This helps you import and build relationships to other …
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WebJan 22, 2024 · Short answer -- You don't. Long answer: In MySQL, the PRIMARY KEY is a UNIQUE key is an INDEX. There is only one PRIMARY KEY; its main function is to …
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