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SQL


Overview

SQL versions and database engines

Recent Contributions

suresh kumar created Procedure for removing duplicate records from SQL Table
suresh kumar created Remove duplicate records
Darren Bartrup-Cook created Relational Algebra
Darren Bartrup-Cook created Overview
Horaciux created Partial or Filtered Index
summary requested topics need improvement proposed changes activity

27 Requested Topics

dismissed handled newest top
14
SQL CURSOR Cursor is used in databases to manipulate individualy the rows returned by a querie. The rows are processed sequentially, allowing read the data and take some action prior to read next value. requested by Ricardo Pontual 1,973 3 comments
11
Three Valued Logic (3VL) Explanation with examples of 3VL used by SQL requested by Cristian Abelleira 272 4 comments
11
Isolation Levels requested by Braydie Grove 58
6
Transaction Management Using Logical Units of Work and the COMMIT and ROLLBACK commands requested by Bernard Dy 1,701 1 comment
6
Constraints Constraints are the rules enforced on data columns on table. These are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the database. Constraints could be column level or table level. Column level constraints are applied only to one column, whereas table level constraints are applied to the whole table. requested by Adrian 2,700 3 comments
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6 Need Improvement

worst popular recent
DELETE missing detail
GROUP BY missing detail
Create a New Table not helpful, unclear
Sequence missing detail
Rebuild index unclear
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0 Proposed Changes

rejected approved need review

No proposed changes.

Changes which need review will be displayed here.

964 Actions

CL. deleted Procedure for removing duplicate records from SQL Table (view change) 2 days ago
CL. deleted Remove duplicate records (view change) 2 days ago
suresh kumar created Procedure for removing duplicate records from SQL Table (view change) 2 days ago
suresh kumar created Remove duplicate records (view change) 2 days ago
CL. deleted Relational Algebra (view change) Oct 8 at 9:18
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