Question

我是SQL界的新手，但已经开发了很多年。我收到一个非常令人困惑的错误。我将最后一个UNION ALL SELECT（带有ncr_actual_dev的那个）添加到SELECT语句中，只有在声明了表时才会导致错误。如果我单独运行整个SELECT语句（ BOLD 中的部分），则完成后没有任何问题。或者，如果我像第二个例子那样运行它，没有错误。我错过了什么？

DECLARE @table TABLE (prod_code varchar(10), 
                      Stage varchar(10), 
                      Stage_Date date)
INSERT INTO @table
  SELECT product_code, 'PLAN' AS Stage, ncr_actual_plan AS Stage_Date 
    FROM ip.product_custom_data 
    WHERE ncr_actual_plan IS NOT NULL
  UNION ALL SELECT product_code, 'CD' AS Stage, ncr_actual_cd 
    FROM ip.product_custom_data 
    WHERE ncr_actual_cd IS NOT NULL
  UNION ALL SELECT product_code, 'CCA' AS Stage, ncr_actual_cca 
    FROM ip.product_custom_data 
    WHERE ncr_actual_cca IS NOT NULL
  UNION ALL SELECT product_code, 'CONCEPT' AS Stage, ncr_actual_concept 
    FROM ip.product_custom_data 
    WHERE ncr_actual_concept IS NOT NULL
  UNION ALL SELECT product_code, 'DEVELOPMENT' AS Stage, ncr_actual_dev 
    FROM ip.product_custom_data 
    WHERE ncr_actual_dev IS NOT NULL

DECLARE @table TABLE (prod_code varchar(10), 
                      Stage varchar(10), 
                      Stage_Date date)
SELECT product_code, 'DEVELOPMENT' AS Stage, ncr_actual_dev 
    FROM ip.product_custom_data 
    WHERE ncr_actual_dev IS NOT NULL

Answer 1

使用：

DECLARE @table TABLE (prod_code varchar(100), Stage varchar(100), Stage_Date date) ...

'DEVELOPMENT' AS Stage有11个字符，您已尝试插入列Stage varchar(10)。

或者你可以使用临时表和SELECT INTO之类的：

SELECT product_code, 'PLAN' AS Stage, ncr_actual_plan AS Stage_Date
INTO #table 
FROM ip.product_custom_data 
WHERE ncr_actual_plan IS NOT NULL
UNION ALL SELECT product_code, 'CD' AS Stage, ncr_actual_cd 
FROM ip.product_custom_data 
WHERE ncr_actual_cd IS NOT NULL
UNION ALL SELECT product_code, 'CCA' AS Stage, ncr_actual_cca 
FROM ip.product_custom_data 
WHERE ncr_actual_cca IS NOT NULL
UNION ALL SELECT product_code, 'CONCEPT' AS Stage, ncr_actual_concept 
FROM ip.product_custom_data 
WHERE ncr_actual_concept IS NOT NULL
UNION ALL SELECT product_code, 'DEVELOPMENT' AS Stage, ncr_actual_dev 
FROM ip.product_custom_data 
WHERE ncr_actual_dev IS NOT NULL;

SELECT *
FROM #table;

添加UNION ALL SELECT后，字符串或二进制数据将被截断

1 个答案: