mysql - 选择具有单个别名的多个列

Question

什么是替代品

select table_name.* as colAlias from table_name

我假设这曾经在 5.5 MySQL 之前工作。

Answer 1

SELECT CONCAT(col1,', ',col2,', ',col3) AS cols
    FROM table_name ORDER BY cols;

或者也

SELECT CONCAT(col1,' ',col2,' ',col3) AS cols
    FROM table_name ORDER BY cols;