英文:
Join in Cognos Data Module returns error message
问题
I want to perform a simple join of two tables. Each Table has only one row.
The join column should be "DP". The Value for DP is "India" in both Tables. The Value comes from a calucation (see screenshot). When I perform the join (full outer join, 1 to 1, no filtering) I receive this error message:
> XQE-DAT-0001 Data source adapter error message:Detected implicit
> cartesian product for FULL OUTER join between logical plans Project
> [India AS DP#384910, Year_#369960, Net_Sales#369961]
> +- Relation[Year_#369960,Net_Sales#369961] parquet and Relation[Industry#369945,Value_#369946] parquet Join condition is
> missing or trivial.
英文:
I want to perform a simple join of two tables. Each Table has only one row.
The join column should be "DP". The Value for DP is "India" in both Tables. The Value comes from a calucation (see screenshot). When I perform the join (full outer join, 1 to 1, no filtering) I receive this error message:
> XQE-DAT-0001 Data source adapter error message:Detected implicit
> cartesian product for FULL OUTER join between logical plans Project
> [India AS DP#384910, Year_#369960, Net_Sales#369961]
> +- Relation[Year_#369960,Net_Sales#369961] parquet and Relation[Industry#369945,Value_#369946] parquet Join condition is
> missing or trivial.
答案1
得分: 1
你收到的错误消息表明你的查询中存在连接条件的问题。你正在进行一个完全外连接（FULL OUTER JOIN），但没有指定要连接的列，这类似于一个完全笛卡尔连接（称为“CROSS”连接）。
要解决这个问题，你需要指定一个有效的连接条件，以基于“DP”列将这些表关联起来。
英文:
The error message you received indicates that there is an issue with the join condition in your query. You're doing a FULL OUTER JOIN without specificy the column on which to join, which is similar to a full cartesian join (called "CROSS" join).
To fix this issue, you need to specify a valid join condition that relates the tables based on the "DP" column.
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