WebAug 22, 2024 · MySQL order by field using CASE Statement MySQL MySQLi Database To order by field, use CASE statement. Let us first create a table − mysql> create table DemoTable (StudentId varchar (100)); Query OK, 0 rows affected (1.69 sec) Insert some records in the table using insert command − WebAnother Example: ORDER BY Several Columns. There are the following SQL statement selects all Employee from the “Employees” table, sorted ascending by the “City” and …
SQL中的三种去重方法小结-每日运维
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SQL中的三种去重方法小结-每日运维
WebThe ORDER BY command is used to sort the result set in ascending or descending order. The ORDER BY command sorts the result set in ascending order by default. To sort the records in descending order, use the DESC keyword. The following SQL statement selects all the columns from the "Customers" table, sorted by the "CustomerName" column: WebJan 29, 2024 · 1 Answer Sorted by: 4 You need to either repeat the expression, or derive it in a separate scope, e.g.: SELECT name, tag, CASE WHEN tag = 'a' THEN 'a2' ELSE 'b2' END AS tag2 FROM ( SELECT name, CASE WHEN name = 'a' THEN 'a' ELSE 'b' END AS tag FROM dbo.table_name ) AS derived; Share Improve this answer Follow edited Jan 29, 2024 at 3:36 WebThere is a simpler way, and that doesn't need a procedure, or several "cases" Just use array Ex: select col1, col2, col3, col4 from table order by case @parameter when '1' then array [col1,col3,col4] when '2' then array [col1] when '3' then array [col4,col2] end tested in postgresql Share Improve this answer Follow edited May 31, 2024 at 21:55 shari wedding ring