如何在雪花的Where子句中编写Select语句

Question

在雪花中运行以下命令时出现以下错误：

“意外的Select语句”

这是我的SQL

SELECT * FROM ABC
WHERE DR2NB NOT IN ( SELECT DR2NB FROM ABC WHERE FLAG='TRUE' )
ORDER BY DR2NB

Answer 1

CREATE OR REPLACE TABLE ABC (DR2NB NUMBER, FLAG VARCHAR);

INSERT INTO ABC VALUES(1,'TRUE'),(2,'FALSE'),(3,'TRUE'),(4,'FALSE'),(1,'TRUE'),(2,'FALSE'),(3,'TRUE'),(4,'FALSE');

SELECT * FROM ABC WHERE DR2NB NOT IN ( SELECT DR2NB FROM ABC WHERE FLAG='TRUE' ) ORDER BY DR2NB;

您也可以通过使用以下查询来获得所需的结果：

SELECT * FROM ABC WHERE FLAG!='TRUE' ORDER BY DR2NB;

Answer 2

很难在没有数据示例的情况下建议更改，但是我建议像这样构造子查询：

With x as(SELECT DR2NB FROM ABC WHERE FLAG='TRUE' ) 
SELECT * 
FROM ABC 
WHERE 
DR2NB NOT IN x 
ORDER BY DR2NB;

参考：

• https://docs.snowflake.net/manuals/sql-reference/constructs/with.html
• https://docs.snowflake.net/manuals/sql-reference/operators-subquery.html
• https://docs.snowflake.net/manuals/user-guide/querying-subqueries.html