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PostgreSQL - find rows where column is empty string (blank)
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In this article, we would like to show you how to find rows where the column value is an empty string in PostgreSQL.
Quick solution:
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SELECT * FROM "table_name" WHERE "column_name" = '';If your column is NULL then the below query works:
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SELECT * FROM "table_name" WHERE "column_name" IS NULL;To show how to find rows where the column value is an empty string, we will use the following table:
Note:
At the end of this article you can find database preparation SQL queries.
In this example, we will find rows from users table with empty email column.
Query:
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SELECT *2
FROM "users"3
WHERE "email" = '';Result:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL,3
"name" VARCHAR(50) NOT NULL,4
"surname" VARCHAR(50) NOT NULL,5
"email" VARCHAR(50),6
PRIMARY KEY ("id")7
);insert_data.sql file:
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INSERT INTO "users"2
( "name", "surname", "email")3
VALUES4
('John', 'Stewart', 'john@email.com'),5
('Chris', 'Brown', ''),6
('Kate', 'Lewis',''),7
('Ailisa', 'Gomez', 'ailisa@email.com'),8
('Gwendolyn', 'James', ''),9
('Simon', 'Collins', ''),10
('Taylor', 'Martin',''),11
('Andrew', 'Thompson', 'andrew123@email.com');