用于获取表中具有不同值的下一个变量的SQL代码

SELECT MAX(id) + 1 AS next_value
FROM table_name

SELECT MAX(column_name) + 1 AS next_value
FROM (
    SELECT DISTINCT column_name
    FROM table_name
) AS subquery

SELECT column_name + 1 AS next_value
FROM (
    SELECT column_name, ROW_NUMBER() OVER (ORDER BY column_name) AS row_num
    FROM table_name
) AS subquery
WHERE column_name + 1 NOT IN (
    SELECT column_name
    FROM table_name
)
ORDER BY row_num
LIMIT 1