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Indexes, SQL SubQuery and Joins-ans.sql. Top. ... Get data with all columns of the sales table, and customer name, customer age, product name, and category are in the same result set. (Use join in the ...

Learn how to use SQL joins to check and fix data integrity and consistency issues across tables. See SQL join examples for finding missing values, duplicates, mismatches, and outliers.

In most implementations of SQL, you pull information from two tables by using a SELECT command in this form: SELECT table1.column1, table1.column2, table2.column1, table2.column2 ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

The indexes on a the tables of a large database make a huge difference in its performance and utility. Without an index, ... How to Reindex SQL Tables. By John Papiewski, Contributor.

A composite index is one index name that is defined for two or more columns. The columns can be specified in any order, and they can have different data types. A composite index name cannot match the ...

The MapReduce framework and its implementations have been extensively used for processing big data. To address users' complex requirements on querying big data, a new type of joins, called the family ...