mysql 。使用 with 并插入它会提示语法错误

Question

我正在尝试在 mysql8 上编写此查询，但它一直告诉我语法错误。我该怎么办？

WITH this_year AS (
    SELECT YEAR(CURDATE())
),
max_val AS (
    SELECT 
        IFNULL(MAX(custom_id_counter), 0) 
    FROM flow_instances AS max_val
    WHERE 
        custom_id_year = YEAR(CURDATE())
)
INSERT INTO flow_instances (
    custom_id_year,
    custom_id_counter
) VALUES (
    this_year,
    max_val+1
);

错误：

Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO flow_instances ( custom_id_year,
custom_id_counter ) VALUES ( ' at line 11

Answer 1

使用insert . . . select:

INSERT INTO flow_instances (custom_id_year, custom_id_counter)
WITH this_year AS (
      SELECT YEAR(CURDATE()) as this_year
     ),
     max_val AS (
      SELECT COALESCE(MAX(custom_id_counter), 0) as max_val
      FROM flow_instances AS max_val
      WHERE custom_id_year = YEAR(CURDATE())
     )
    SELECT ty.this_year, mv.max_val + 1
    FROM this_year ty CROSS JOIN
         max_val mv;

您需要引用 CTE 才能使用它们定义的值。

mysql 。使用 with 并插入它会提示语法错误

mysql cte . using with and insert it alerts a syntax error

mysql

sql

common-table-expression

mysql-8.0