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What is the use of the new custom SQL query in Tableau?

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What is the use of the new custom SQL query in Tableau?

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Custom SQL query is written after connecting to data for pulling the data in a structured view. For example, suppose, we have 50 columns in a table, but we need just 10 columns only. So instead of taking 50 columns, we can write a SQL query. The performance will increase.

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