google-big-queryHow can I use the CASE WHEN statement in Google Big Query?
The CASE WHEN statement in Google Big Query is a powerful tool for creating conditional statements in SQL. It allows you to evaluate a set of expressions and return a result based on the evaluation.
For example, the following code block can be used to create a new column in Big Query that returns a string value based on the value of another column:
SELECT
CASE
WHEN column1 < 0 THEN 'Negative'
WHEN column1 = 0 THEN 'Zero'
ELSE 'Positive'
END AS new_column
FROM my_table
The output of this code will be a new column in the table called new_column
which will contain the string value Negative
, Zero
, or Positive
depending on the value of column1
.
The syntax of the CASE WHEN statement is as follows:
CASE
WHEN expression1 THEN result1
WHEN expression2 THEN result2
...
ELSE resultN
END
The expression
can be any valid Big Query expression, such as a comparison expression, a function, etc. The result
can be any valid Big Query expression, such as a string, an integer, a column, etc.
For more information on the CASE WHEN statement in Big Query, please refer to the official documentation.
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