LEFT JOIN in SQL – Ultimate Guide Including Performance Tips & FAQs (Updated)
Once you are doing relational databases, LEFT JOIN in SQL is essential for data merging, binding, and manipulating. LEFT JOIN allows you to merge multiple tables without losing records from ...
Asiri Gunasena
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SQL DECLARE Variable: Complete Guide | Examples in All 5 Databases
Variables are the heart of SQL programming and the most powerful tools inside SQL programming. SQL DECLARE Variable allows you to store data temporarily, reuse values in multiple places, calculate ...
Asiri Gunasena
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How to Check SQL Version (Any Database 7 Examples)
Once you’re dealing with databases or troubleshooting SQL-related bugs, it is important to get and check SQL version your system is running.There are a lot of SQL engines available now ...
Asiri Gunasena
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COALESCE SQL – Full Guide with Real Examples (All Databases)
COALESCE SQL: The COALESCE function looks for the first non-null value from the expression. Once the database reaches a non-null value, stop the traverse through the remaining expressions. Therefore, it is a more versatile ...
Asiri Gunasena
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how to use Common Table Expression | Hidden power in SQL
In this article, I plan to describe what a common table expression is, and how to write sql common table expression in database programming languages. Other than that, it will ...
Asiri Gunasena
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How to oracle SQL limit rows? 6 ways
In SQL, there are several ways to Oracle SQL limit rows. Limiting rows or selecting the top-most record improves the performance of the query. Also, showing millions of records does ...
Asiri Gunasena
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How to Oracle Cast String to Date
How to convert a string to a date in Oracle? Is there a function in Oracle? It is very easy to Oracle cast string to date with the TO_DATE function. ...
Asiri Gunasena
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How to take Distinct Count in Oracle
The Oracle Count function returns only the number of records available for the attribute. But how to take a Distinct count in Oracle? COUNT ( [ DISTINCT | ALL ] ...
Asiri Gunasena
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