Question

所以我有以下PSQL查询返回此错误。问题似乎是coalesce(d.name, e.first_name, g.name) as sourcedest,中的sales行被Postgres视为character varying。因为

而输出UNION错误

'sdfsdf' as sourcedest

resupply

NULL as sourcedest

audit

被视为unknown。有没有办法强制改变角色？

    SELECT * 
    FROM (
    WITH
    sales AS (
        SELECT a.fk_item_id, a.date_time_created, a.quantity, 
        CASE
            WHEN a.fk_sale_id is NULL THEN CONCAT('Meter Reading: ', a.instance_type)
            ELSE a.instance_type
        END as instance_type,
        coalesce(d.name, e.first_name, g.name) as sourcedest,
        CASE
            WHEN a.fk_sale_id is NOT NULL THEN CONCAT(h.first_name, ' ', h.last_name)
            ELSE CONCAT(i.first_name, ' ', i.last_name)
        END as employee

        FROM sales_iteminstance a
        LEFT JOIN sales_sale b ON b.id = a.fk_sale_id
        LEFT JOIN sales_meterreading c ON c.id = a.fk_meter_reading_id

        LEFT JOIN pr_creditline d ON d.id = b.fk_creditline_id
        LEFT JOIN pr_client e ON e.id = b.fk_client_id

        LEFT JOIN pr_gasmeter f ON f.id = c.fk_gas_meter_id
        LEFT JOIN pr_creditline g ON g.id = f.fk_creditline_id

        LEFT JOIN hr_employee h ON h.id = b.fk_employee_id
        LEFT JOIN hr_employee i ON i.id = c.fk_employee_id
    ),
    resupply AS (
        SELECT a.fk_item_id, a.date_time_created, a.quantity,
        CASE
         WHEN (b.movement = 'Inbound') THEN 'Resupply In'
         WHEN (b.movement = 'Outbound') THEN 'Resupply Out'
        END AS instance_type,
        'sdfsdf' as sourcedest,
        CONCAT(c.first_name, ' ', c.last_name) as employee

        FROM inventory_resupplylogiteminstance a
        INNER JOIN inventory_resupplylog b ON b.id = a.fk_resupply_log_id
        INNER JOIN hr_employee c ON c.id = b.fk_employee_id
    ),
    audit AS (
        SELECT a.fk_item_id, a.date_time_created, a.difference as quantity, 'Audit' as instance_type, NULL as sourcedest, CONCAT(c.first_name, ' ', c.last_name)
        FROM inventory_itemauditinstance a
        INNER JOIN inventory_itemaudit b ON b.id = a.fk_item_audit_id
        INNER JOIN hr_employee c ON c.id = b.fk_employee_id
    )
    SELECT * FROM sales
    UNION
    SELECT * FROM resupply
    UNION
    SELECT * FROM audit
    ) as res

    WHERE fk_item_id = {2} AND date_time_created >= ('{0}'::date) AND date_time_created < ('{1}'::date)
    ORDER BY date_time_created DESC

有人可以告诉我这有什么问题吗？并提供有关如何在将来调试此类错误的提示。

编辑：想出来了，我只需要将'sdfsdf' as sourcedest更改为cast('sdfsdf' character varying) as sourcedest

PSQL错误：无法找到从未知到字符变化的转换函数

0 个答案: