case when usage sql
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.
Jul 17, 2023 pm 03:37 PM
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.
Jul 17, 2023 pm 03:42 PM
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.
Jun 13, 2020 pm 02:54 PM
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]].
Sep 03, 2020 am 11:33 AM
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”.
Aug 01, 2022 pm 05:32 PM
Usage of case when in sql
Case has two formats: simple case function and case search function. The simple case function is relatively simple to write, but compared with the case search function, there are some functional limitations, such as writing predicates.
Feb 13, 2020 pm 04:35 PM
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