Sql tutorial, tutorials sql
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This tutorial teaches the basics of SQL and how to write SQL queries. SQL (Structured Query Language) is used to modify and access data from a database. It was first developed by IBM in the 1970s and has become a standard language used by most relational database management systems like Oracle, Microsoft SQL Server, and Sybase. Some common SQL commands include SELECT, UPDATE, INSERT, DELETE, WHERE, and ORDER BY clauses.
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Sql renameVivek Singh The document discusses the SQL RENAME statement, which allows renaming a table in some database management systems. It provides the syntax for renaming a table using RENAME TABLE in standard SQL and ALTER TABLE in Oracle. An example demonstrates renaming the "employees" table to "employees_new" and verifies that the data is retained in the new table name.
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Sql query tuning or query optimizationVivek Singh This document provides tips for optimizing SQL queries to improve performance. Some key recommendations include:
1) Select only necessary columns instead of using SELECT * to reduce overhead
2) Use EXISTS, IN, and joins appropriately depending on where filter criteria is specified
3) Minimize subqueries and try to rewrite queries using joins when possible
4) Be cautious of conditions in the WHERE clause to ensure optimal execution order
Sql query tips or query optimization
Sql query tips or query optimizationVivek Singh Here are some tips for optimizing SQL queries:
1) Only select the necessary columns and rows to minimize data retrieval and transfer.
2) Prune select lists to only include columns that are truly necessary based on query predicates.
3) When creating new tables, include a unique clustered index on a numeric column to improve performance of joins and queries.
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