雪花 |插入覆盖失败，表达式类型与列数据类型不匹配，期望 TIMESTAMP_NTZ(9) 但列得到 FLOAT

Question

尝试将具有 x+y 列的 table 中的覆盖数据插入具有 x+z 列的 table 并出现错误 SQL compilation error: Expression type does not match column data type, expecting TIMESTAMP_NTZ(9) but got FLOAT for column DATEMODIFIED。在这种情况下，两个 table 上 DATEMODIFIED 的数据类型都是 TIMESTAMP_NTZ(9)。查询如下

insert overwrite into tgt_table
select x1,x2,x3, DATEMODIFIED,  null as z1, null as z2 from 
(select x1,x2,x3, DATEMODIFIED from src_table)

来源的列描述 table
目标的列描述 table

注：

Datemodified 在源 table 中为空，甚至将 DateModified 替换为 COALESCE(DateModified, CURRENT_TIMESTAMP::TIMESTAMP_NTZ) as DateModified 没有解决问题。
像下面这样重写查询并不能解决问题

insert overwrite into tgt_table
select x1,x2,x3, DATEMODIFIED::TIMESTAMP_NTZ  as DateModified,  null as z1, null as z2 from 
(select x1,x2,x3, DATEMODIFIED::TIMESTAMP_NTZ  as DateModified from src_table)

Answer 1

我怀疑目标 table 中列的顺序不同。尝试在您的命令中定义目标列，如下所示：

insert overwrite into tgt_table (x1,x2,x3, DATEMODIFIED, z1, z2)
select x1,x2,x3, DATEMODIFIED,  null as z1, null as z2 from 
(select x1,x2,x3, DATEMODIFIED from src_table)

参考：INSERT target_col_name

雪花 |插入覆盖失败，表达式类型与列数据类型不匹配，期望 TIMESTAMP_NTZ(9) 但列得到 FLOAT

Snowflake | Insert overwrite fails with Expression type does not match column data type, expecting TIMESTAMP_NTZ(9) but got FLOAT for column

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