与和

2017-05-05 36 views 0 likes

PGSQL requsrive要求我需要一些帮助与递归请求与和

选择递归：

WITH RECURSIVE r (child,name,qty) AS (

    SELECT l.item child, i.name as name, l.qty 
    FROM items  
     LEFT JOIN lines l on i.bom = l.bom 

    UNION  

    SELECT d.child, d.name, d.qty 
    FROM (
     SELECT l.item child, i.name, l.qty 
     FROM items i 
     LEFT JOIN bom_lines l on i.bom = l.bom 
    ) as d 
     JOIN r ON d.name = r.child 
) 
SELECT * FROM r;

，但它不会计算总的数量

来源

2017-05-05 StackUser

你想这个“材料清单“仅针对特定项目的结果（在您的示例中为”A“），还是针对每个项目（可能是顶级项目）？（顶级即它存在于'bom_heads'中。） – pozs

回答

WITH RECURSIVE r (child,name,qty) AS (
    SELECT l.item child, i.name as name, l.qty 
    FROM items i 
    LEFT JOIN bom_lines l on i.bom = l.bom 
    UNION  
    SELECT d.child, d.name, d.qty+r.qty FROM (SELECT l.item child, i.name, l.qty 
    FROM items i 
    LEFT JOIN bom_lines l on i.bom = l.bom) as d 
    JOIN r 
    ON d.name = r.child 
) 
SELECT * FROM r;

来源

2017-05-05 16:30:36

与和

回答

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