sql计算去除值后面的零

bidPrice 计算结果保留了太多小数位数。

推荐方案4（方案4：去掉末尾的零（保持小数，但去掉无意义的0））

方案1：使用 ROUND() 函数（推荐）

将计算结果四舍五入到指定小数位数：

select
    -- 基础项目信息（对应 SimilarProjectVO 核心字段）
    pwtpd.section_id AS sectionId,
    pwtpd.section_name AS projectName,  -- 项目名称（取标段名称）
    pwtpd.tower_in_total_price AS towerInTotalPrice, -- 塔筒报价
    pwtpd.project_price_contain_tower AS projectPriceContainTower, -- 项目报价包含塔筒
    pwtpd.project_price_not_tower AS projectPriceNotTower, -- 项目报价不包含塔筒
    pwtpd.win_bid_amount,
    -- 使用 ROUND 保留2位小数
    ROUND(
        (CAST(IFNULL(pwtpd.win_bid_amount, 0) AS DECIMAL(18, 0))
        / NULLIF(CAST(IFNULL(pwtpd.project_capacity, 0) AS DECIMAL(18, 0)) * 1000, 0)
        ), 2
    ) AS bidPrice,  -- 中标单价（保留2位小数）
    
    -- 其他字段保持不变
    bpi.purchase_type AS purchaseType, -- 是否框架采购
    CASE
    WHEN pwtpd.single_unit_capacity REGEXP '^[0-9.]+$'
    THEN CAST(pwtpd.single_unit_capacity AS DECIMAL(10,2))
    WHEN pwtpd.single_unit_capacity REGEXP '^[0-9.]+[～-][0-9.]+$'
    THEN (
    CAST(SUBSTRING_INDEX(pwtpd.single_unit_capacity, '～', 1) AS DECIMAL(10,2)) +
    CAST(SUBSTRING_INDEX(pwtpd.single_unit_capacity, '～', -1) AS DECIMAL(10,2))
    ) / 2
    ELSE NULL
    END AS singleUnitCapacityValue,
    CASE
    WHEN pwtpd.single_unit_capacity REGEXP '^[0-9.]+$'
    THEN CONCAT('单机', CAST(CAST(pwtpd.single_unit_capacity AS DECIMAL(10,2)) AS CHAR), 'MW')
    WHEN pwtpd.single_unit_capacity REGEXP '^[0-9.]+[～-][0-9.]+$'
    THEN CONCAT('单机', CAST( (
    CAST(SUBSTRING_INDEX(REPLACE(pwtpd.single_unit_capacity, '-', '～'), '～', 1) AS DECIMAL(10,2)) +
    CAST(SUBSTRING_INDEX(REPLACE(pwtpd.single_unit_capacity, '-', '～'), '～', -1) AS DECIMAL(10,2))
    ) / 2 AS CHAR), 'MW')
    ELSE NULL
    END AS singleUnitCapacity,
    CASE
    WHEN pwtpd.project_capacity REGEXP '^[0-9.]+$'
    THEN CAST(pwtpd.project_capacity AS DECIMAL(10,2))
    WHEN pwtpd.project_capacity REGEXP '^[0-9.]+[～-][0-9.]+$'
    THEN (
    CAST(SUBSTRING_INDEX(pwtpd.project_capacity, '～', 1) AS DECIMAL(10,2)) +
    CAST(SUBSTRING_INDEX(pwtpd.project_capacity, '～', -1) AS DECIMAL(10,2))
    ) / 2
    ELSE NULL
    END AS projectCapacityValue,
    pwtpd.tower_type as towerType,
    pwtpd.total_capacity_float_requirement as capacityFloatReq
from product_wind_turbine_detail_summary pwtpd
    left join bid_project_info bpi on pwtpd.section_id = bpi.section_id and pwtpd.company_id = bpi.company_id
where pwtpd.win_bid_status = 1 and pwtpd.company_id is not null and pwtpd.is_mixed_arrangement_allowed ='否'

方案2：使用 CAST() 指定小数位数

如果希望统一小数位数，可以使用 CAST()：

-- 将 ROUND() 替换为 CAST()
CAST(
    (CAST(IFNULL(pwtpd.win_bid_amount, 0) AS DECIMAL(18, 0))
    / NULLIF(CAST(IFNULL(pwtpd.project_capacity, 0) AS DECIMAL(18, 0)) * 1000, 0)
    ) AS DECIMAL(18, 2)
) AS bidPrice,  -- 保留2位小数

方案3：完全去掉小数部分（只保留整数）

如果只需要整数：

-- 使用 FLOOR() 向下取整 或 ROUND(..., 0) 四舍五入取整
FLOOR(
    (CAST(IFNULL(pwtpd.win_bid_amount, 0) AS DECIMAL(18, 0))
    / NULLIF(CAST(IFNULL(pwtpd.project_capacity, 0) AS DECIMAL(18, 0)) * 1000, 0)
    )
) AS bidPrice,  -- 只保留整数部分（向下取整）

方案4：去掉末尾的零（保持小数，但去掉无意义的0）

使用 TRIM() 和 CAST() 组合去掉末尾的零：

-- 保留小数，但去掉末尾的零
TRIM(TRAILING '.' FROM TRIM(TRAILING '0' FROM 
    CAST(
        (CAST(IFNULL(pwtpd.win_bid_amount, 0) AS DECIMAL(18, 0))
        / NULLIF(CAST(IFNULL(pwtpd.project_capacity, 0) AS DECIMAL(18, 0)) * 1000, 0)
        ) AS DECIMAL(18, 4)
    )
)) AS bidPrice,  -- 保留4位小数，去掉末尾的零