We hope that this EDUCBA information on “MySQL CASE Statement” was beneficial to you. Hence, we can say that the CASE statement in MySQL makes the query code more efficient and readable.The conditional expression compares the range of distinct values and produces the corresponding result, which holds the data type depending on the context used in the query. We can only use the CASE statement with stored procedures, events, functions, and triggers.MySQL CASE statement permits executing the IF ELSE logic to the SQL queries to examine the conditional statements and fetch the required result sets or values from the database tables.Secondly, after this, the Sum() function determines the total number of orders according to the order status.

CASE Statement with SUM() and COUNT as Aggregate Functions in the SQL SELECT QueryĮxplanation: In the query above, firstly, the CASE statements execute and return 1 when the case matches the respective Order Status such as Success, In Progress, Shipped, Cancelled, On Hold, and otherwise zero. SELECT statement to display the Table Dataģ. SELECT Statement to Display the Table Dataģ. Inserting a Few Fields INSERT INTO Students (StudentID, StudentName, State, City) VALUES ('01', 'Vedika', 'UP', 'Kanpur') ģ. Creating a Table CREATE TABLE Students(StudentIDint, StudentNamevarchar(255), State varchar(255), City varchar(255) ) Ģ. For this, we must create a table for Students and insert some values.ġ. Let us execute the above SQL query and show the result on the CASE part execution. Examples to Implement MySQL CASE Statementįollowing are the CASE statement examples with outputs: Example #1 – CASE Statement with SELECT & ORDER BY Clauses Also, if the CASE conditional expression uses a numeric context, the value returned will be either in integer, decimal or real value data type. For example, if a character string context is used in the statement, the result value will be in the same data type, string. Here, the CASE on satisfying results is the value whose MySQL Data Type is based on the context it is used for. Now for Search CASE, it follows the same logical procedure as Simple CASE, but one part of the search case makes it different. You should not use NULL in the WHEN clause value because if executed, the logical part will be NULL = NULL which is FALSE. But if no value is equal, it returns the ELSE part value if provided. In the Simple CASE, the CASE the column value is matched with the conditional statement value in the WHEN clauses for equivalence and then produces the result value after that one in the syntax. Here, we have fetched the names of students, states, and cities where the CASE is applied with the ORDER BY clause to sort the result rows.

If the case statement is not valid or the value is not found, then part value, i.e., State column value, is returned. In the above illustration, we have put the CASE statement on columns State and City, where if the State column contains a NULL value, then the query displays the City column value. Suppose the following query explains the CASE logical part where we have mentioned a table like Students with fields StudentName, State, City then the query will be written as: SELECT StudentName, State, City FROM Students ORDER BY (įrom here, we will come to know that when we have applied the CASE statement in the SELECT query to fetch the particular value that satisfies a specific case condition. We use a CASE statement to provide the result values based on a matched condition using the logical control method to the SQL queries and the SQL clauses like SELECT, WHERE, and ORDER BY. The CASE Statement contains two procedures: one is Simple CASE, and the other one is Searched CASE. You can evaluate through the syntax shown below: SELECT column1,column2,įROM TableName How Does CASE Statement Work in MySQL?

We use the CASE statement anywhere with the clauses such as WHERE SELECT and ORDER BY to make a valid statement. This part allows adding logical CASE statements in a query in MySQL.

Value: Denotes the value to be displayed when the else part is meeting.

Value1, value2, ….,valueN: Represents the values required to display when a condition is met.

Cond1,cond2,….,condN: Denotes the required conditions to be evaluated in the list of CASE statements.

Mysql case else