What is CASE statement in MySQL?
The MySQL CASE Statement The CASE statement goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause.
What are case statements in SQL give examples?
In a simple case statement, it evaluates conditions one by one. Once the condition and expression are matched, it returns the expression mentioned in THEN clause. Usually, we store abbreviations in a table instead of its full form. For example, in my Employee table, I have used abbreviations in Gender and StateCode.
Can you use case in MySQL?
The CASE expression has two forms: simple CASE and searched CASE . Note that MySQL has a CASE statement that you can use only in stored programs such as stored procedures, stored functions, events and triggers, which is not the CASE expression covered in this tutorial.
Can we use CASE statement in WHERE clause in MySQL?
Yes, you can use the CASE operator (13.4 Control Flow Functions ) as an operator in a WHERE clause. It is logically identical to a bunch of nested IF() functions, and evaluates to a single value. The syntax of CASE in stored procedures is a bit different and can’t be used in queries: 14.6.
Is MySQL case sensitive?
Table names are stored in lowercase on disk and name comparisons are not case-sensitive. MySQL converts all table names to lowercase on storage and lookup. This behavior also applies to database names and table aliases.
How does case work in SQL?
- CASE WHEN is used to determine conditional statements in SQL. CASE declares the start of the conditions. WHEN declares a condition. THEN declares the return of a true condition.
- You can have a multitude of WHEN statements.
- AS can be used to create a header for the return data, otherwise it is given the header “case”
What is the main use of a case statement?
What is the main use of a CASE statement? Explanation: CASE is basically used in the design of state machines. Since there are various combinations of present state and next states due to which there are various choices to select from.
How do I create a case query in MySQL?
The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it will return the value in the ELSE clause.
What is the case function?
CASE is a complex function that has two forms; the simple-when form and the searched-when form. In either form CASE returns a result, the value of which controls the path of subsequent processing.
Why are MySQL cases insensitive?
How do I make MySQL not case-sensitive?
In order to prevent this problem you need to set the mysql variable lower_case_table_names=1 in /etc/mysql/my. cnf file. In this way the mysql server will store the table in the file system using lower case.