Sometimes, column names are so technical that make the query’s output very difficult to understand. MySQL CASE WHEN with SELECT to display odd and even ids? Aliases can't be used in WHERE.There are couple workarounds. Put numfield >3 in HAVING instead of WHERE (works for Mysql only) 3. MySQL alias for columns. To change a column name, enter the following statement in your MySQL shell: Display distinct column name in MySQL; Python program to print the initials of a name with last name in full? How to convert Lower case to Upper Case using C#? If there is no ELSE part and no conditions are true, it returns NULL. Rename all tables and columns to lower case in MySQL? So, once a condition is true, it will stop reading and return the result. Optionally, you can add the keyword AS in between the column name and the column alias to clearly indicate the use of alias. Java program to print the initials of a name with last name in full; How to separate last name and first names in single column into two new columns in MySQL? How to change column names to capital letters from lower case or vice versa in R? The query is as follows − ... Now you can write the query we discussed above to update column id with Case WHEN THEN ELSE. Make all column names lower case in MySQL with a single query; Lower case column names with MySQL SELECT? The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). The parameters or components of the CASE SQL statement are: This clause is available since MySQL version 8.0. mysql> SELECT col_name FROM tbl_name AS a WHERE a.col_name = 1 OR A.col_name = 2; However, this same statement is permitted on Windows. ... , -> Name varchar(100) -> ); Query OK, 0 rows affected (0.78 sec) Insert some records in the table using insert command. The following statement illustrates how to use the column alias: Consider the following facts when using column alias: Column alias is added in the SELECT statement immediately after the column name. 1. If no conditions are true, it will return the value in the ELSE clause. Parameters of the CASE Statement. SELECT `id` , `name` , `class` , `mark` , `sex` , CASE WHEN mark BETWEEN 90 AND 100 THEN 'A' WHEN mark BETWEEN 80 AND 89 THEN 'B' WHEN mark BETWEEN 70 AND 79 THEN 'C' ELSE 'FAIL' END AS grade FROM `student` Download the SQL dump of the above student table WHEN condition_n THEN result_n ELSE result END case_name. Repeat CASE in WHERE as oNare suggests 2. To avoid problems caused by such differences, it is best to adopt a consistent convention, such as always creating and referring to databases and tables using lowercase names. The query is as follows − Rewrite query to use inline view syntax : SELECT a. Syntax Use column alias if the original column name does not meet your requirements. Setting column values as column names in the MySQL query result? To give a column a descriptive name, you can use a column alias. Java String to Lower Case example. The CASE statement can be written in a few ways, so let’s take a look at these parameters. The simplest way to rename a column is to use the ALTER TABLE command with the RENAME COLUMN clause. Concatenate all the columns in a single new column with MySQL; MySQL query to make a date column NULL? MySQL supports two kinds of aliases which are known as column alias and table alias. * FROM ( SELECT * , CASE t2.field_max_occupancy_value WHEN 'one' THEN 1 WHEN 'two' THEN 2 WHEN 'three' THEN 3 WHEN 'four' THEN 4 WHEN 'five' THEN 5 … How to find all tables that contains two specific columns in MySQL? 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