如何将 CTE 转换为普通查询？

Question

如何将其转换为普通查询？

WITH cte AS (
    SELECT agentID, 
           SUM(bonus > 0) OVER (PARTITION BY agentID 
                                ORDER BY `year` * 12 + `month`
                                RANGE BETWEEN 2 PRECEDING AND CURRENT ROW) flag
    FROM test
)
SELECT agentID
FROM cte
WHERE flag = 3;

我需要转换这个，因为我认为mariadb与cte不兼容。我也不太熟悉 cte，我不知道如何将其分解为 php.

中的正常 sql 查询

更新：

我试着这样做运行 cte

<?php
$servername = "localhost";
$username = "root";
$password = "";
$db = "sample_db";

// Create connection
$conn = new mysqli($servername, $username, $password, $db);

// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}


$stmt = $conn->query("SELECT agentID, bonus FROM (WITH cte AS (
    SELECT DISTINCT agentID, 
           SUM(bonus > 0) OVER (PARTITION BY agentID 
                                ORDER BY `year` * 12 + `month`
                                RANGE BETWEEN 2 PRECEDING AND CURRENT ROW) flag
    FROM sample_tbl
)) where agentID = '10710' && flag = 3");

    if($stmt->num_rows > 0){
        echo "You are elligible to take a course!";
    } else{
           echo "You are not elligible to take a course!";
        }




?>

但是不行，结果显示

"Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') where agentID = '10710' && flag = 3' at line 7 in C:\xampp\htdocs\try\index.php:16 Stack trace: #0 C:\xampp\htdocs\try\index.php(16): mysqli->query('SELECT agentID,...') #1 {main} thrown in C:\xampp\htdocs\try\index.php on line 16"

Answer 1

确实MariaDB is compatible with CTEs，但是如果您出于任何原因不想处理ctes，您总是可以将其转换为子查询：

SELECT agentID
FROM (
    SELECT agentID, 
           SUM(bonus > 0) OVER (PARTITION BY agentID 
                                ORDER BY `year` * 12 + `month`
                                RANGE BETWEEN 2 PRECEDING AND CURRENT ROW) flag
    FROM test ) agents_with_summed_bonus
WHERE flag = 3;

如果这个查询（而不是用 cte 构建的那个）对你不起作用，那么这意味着你的初始查询在你的表方面有一些错误。

Answer 2

再次更新：

它现在对我有用，这是我的最终代码：

<?php
$servername = "localhost";
$username = "root";
$password = "";
$db = "sample_db";

// Create connection
$conn = new mysqli($servername, $username, $password, $db);

// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}


$stmt = $conn->query("SELECT DISTINCT agentID FROM (SELECT DISTINCT agentID, 
SUM(bonus > 0) OVER (PARTITION BY agentID 
                     ORDER BY `year` * 12 + `month`
                     RANGE BETWEEN 2 PRECEDING AND CURRENT ROW) flag from sample_tbl) as cte where agentID = '61599' && flag = 3");

    if($stmt->num_rows > 0){
        echo "You are elligible to take a course!";
    } else{
           echo "You are not elligible to take a course!";
        }




?>

如何将 CTE 转换为普通查询？

How to convert CTE to normal query?

php

sql

common-table-expression

mariadb