英文:
Bigquery execute expression from string column
问题
在BigQuery中，我有一个表，其中有一个需要动态替换和执行的表达式。
例如
配置表
表，条件
XYZ，“if(1>2,true,false)”
我尝试了立即执行的过程。
声明条件字符串默认值=（从config_table中选择条件）;
声明SQL字符串;
设置SQL =“从other_table中选择* where @condition”;
使用条件作为条件立即执行SQL
它将该值替换为字符串而不是评估表达式。是否有一种方法可以将其替换为表达式？提前感谢。
英文:
In bigquery, ive a table which has an expression which needs to be dynamically substituted and executed.
Eg
Config table
Table, condition
XYZ, "if(1>2,true,false)"
I tried procedural execute immediately.
Declare condition string default = (select condition from config_table);
Declare SQL string;
Set SQL ="Select * from other_table Where @condition";
Execute immediate SQL using condition as condition
It is replacing the value as string instead of evaluating the expression. Is there any way to substitute it as an expression ? Thanks in advance.
答案1
得分: 1
Declare condition string default (select condition from config_table);
Declare SQL string;
Set SQL ="Select * from other_table Where %s";
Execute immediate format(SQL, condition)
考虑如下：
声明条件字符串默认为（从config_table中选择条件）;
声明SQL字符串;
设置SQL为“从other_table中选择* Where %s”;
立即执行格式(SQL, condition)
英文:
Consider below:
Declare condition string default (select condition from config_table);
Declare SQL string;
Set SQL ="Select * from other_table Where %s";
Execute immediate format(SQL, condition)
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