5 Points to Check First When SQL Is Slow: How to Improve Execution Plans, Indexes, and JOINs

When you execute an SQL query, the results do not return quickly.You may have had no issues during development, but the ...

Rows disappeared despite using (+)—Reading legacy Oracle outer joins

Even though the intention is an outer join that keeps all rows from A, rows missing in B are disappearing. First, I want to ...
TechRepublic

SQL JOINs make it easy to find and fix missing data

Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash course in JOIN syntax. In response to previous SQL lessons, TechRepublic ...
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Using a LEFT OUTER JOIN vs. RIGHT OUTER JOIN in SQL

In this excerpt from SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, John L. Viescas and Michael J. Hernandez discuss the LEFT OUTER JOIN vs. the RIGHT OUTER JOIN and offer ...
TechRepublic

Understand the effects of NULLs on inner and outer JOINs

In this SQL Server tip, Arthur Fuller explains the effects of NULLs, and the different results obtained by inner and outer JOINs. SQL Server developers must understand two things: the difference ...