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case when usage sql

The usage of case when is to perform different operations according to different conditions in SQL queries. This topic provides you with articles, downloads, and course content related to case when for free download and experience.

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time：2023-07-17 15:45:31

case when usage in sql Case when in SQL is used to perform different operations based on different conditions in SQL queries. You can make judgments based on any conditions and perform corresponding operations based on the results of the conditions. The working principle of the CASE WHEN statement is to judge the conditions one by one from top to bottom. Once a condition is met, the corresponding operation will be performed, and only the first one that satisfies the condition will be executed. Conditional operations.

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sql case when usage The usage of sql case when allows different operations to be performed based on different conditions. Whether it's a simple classification or complex nested conditions, the CASE WHEN statement provides a flexible and readable way to handle different situations. By mastering and using the CASE WHEN statement proficiently, we can better process and analyze data.

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Detailed explanation of usage of sql statement case when The usage of [case when] in SQL is: 1. Use [case field name when field value then value 1 else value 2 end] to judge the field value; 2. Use [case when condition then value 1 else value 2 end] to judge Field value.

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What is the usage of mysql case when The usage of mysql case when is: 1. Used as a simple search, the syntax is [CASE [col_name] WHEN [value1]]; 2. Used as a search function, the syntax is [CASE WHEN [expr] THEN [result1]].

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How to use mysql case when In mysql, "case when" is used to calculate a condition list and return one of multiple possible result expressions; "case when" has two syntax formats: 1. Simple function "CASE[col_name]WHEN[value1]THEN[result1 ]…ELSE[default]END”; 2. Search function “CASE WHEN[expr]THEN[result1]…ELSE[default]END”.

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