Where
Oh where has my translation reference gone?
Description
Limits the results of the FROM
clause of a query or a subquery based on the specified condition. (Databricks SQL Language Reference WHERE)
The WHERE
clause specifies a condition that acts as a filter. (Snowflake SQL Language Reference WHERE)
Syntax
WHERE boolean_expression
Sample Source Patterns
Setup data
Databricks
CREATE TABLE person (id INT, name STRING, age INT);
INSERT INTO person VALUES
(100, 'John', 30),
(200, 'Mary', NULL),
(300, 'Mike', 80),
(400, 'Dan' , 50);
Snowflake
> CREATE TABLE person (id INT, name STRING, age INT);
> INSERT INTO person VALUES
(100, 'John', 30),
(200, 'Mary', NULL),
(300, 'Mike', 80),
(400, 'Dan' , 50);
Pattern code
Databricks
-- 1. Comparison operator in `WHERE` clause.
SELECT * FROM person WHERE id > 200 ORDER BY id;
-- 2. Comparison and logical operators in `WHERE` clause.
SELECT * FROM person WHERE id = 200 OR id = 300 ORDER BY id;
-- 3. IS NULL expression in `WHERE` clause.
SELECT * FROM person WHERE id > 300 OR age IS NULL ORDER BY id;
-- 4. Function expression in `WHERE` clause.
SELECT * FROM person WHERE length(name) > 3 ORDER BY id;
-- 5. `BETWEEN` expression in `WHERE` clause.
SELECT * FROM person WHERE id BETWEEN 200 AND 300 ORDER BY id;
-- 6. Scalar Subquery in `WHERE` clause.
SELECT * FROM person WHERE age > (SELECT avg(age) FROM person);
-- 7. Correlated Subquery in `WHERE` clause.
SELECT * FROM person AS parent
WHERE EXISTS (SELECT 1 FROM person AS child
WHERE parent.id = child.id
AND child.age IS NULL);
Snowflake
-- 1. Comparison operator in `WHERE` clause.
SELECT * FROM person WHERE id > 200 ORDER BY id;
-- 2. Comparison and logical operators in `WHERE` clause.
SELECT * FROM person WHERE id = 200 OR id = 300 ORDER BY id;
-- 3. IS NULL expression in `WHERE` clause.
SELECT * FROM person WHERE id > 300 OR age IS NULL ORDER BY id;
-- 4. Function expression in `WHERE` clause.
SELECT * FROM person WHERE length(name) > 3 ORDER BY id;
-- 5. `BETWEEN` expression in `WHERE` clause.
SELECT * FROM person WHERE id BETWEEN 200 AND 300 ORDER BY id;
-- 6. Scalar Subquery in `WHERE` clause.
SELECT * FROM person WHERE age > (SELECT avg(age) FROM person);
-- 7. Correlated Subquery in `WHERE` clause.
SELECT * FROM person AS parent
WHERE EXISTS (SELECT 1 FROM person AS child
WHERE parent.id = child.id
AND child.age IS NULL);
Known Issues
No issues were found
Related EWIs
No related EWIs
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