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PostgreSQL - add index to existing table using CREATE INDEX
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In this article, we would like to show you how to add index to an existing table using CREATE INDEX statement in PostgreSQL.
Quick solution:
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CREATE INDEX "index_name"2
ON "table_name" ("column1", "column2", "columnN");To show how the CREATE INDEX statement works, 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 create an index for the salary column in users table.
Query:
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CREATE INDEX "salary_index"2
ON "users" ("salary");Result:
1. Using query
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SHOW INDEX FROM "users" FROM "dirask"; -- where users-table_name, dirask-database_name
2. Using HeidiSQL
In this example, we will create an index on the name and surname columns in users table.
Query:
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CREATE INDEX "full_name_index"2
ON "users" ("name", "surname");Result:
1. Using query
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SHOW INDEX FROM "users" FROM "dirask"; -- where users-table_name, dirask-database_name
2. Using HeidiSQL
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
"salary" DECIMAL(15,2) NOT NULL,6
PRIMARY KEY ("id")7
);insert_data.sql file:
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INSERT INTO "users"2
( "name", "surname", "salary")3
VALUES4
('John', 'Stewart', '3512.00'),5
('Chris', 'Brown', '1344.00'),6
('Kate', 'Lewis', '6574.00'),7
('Ailisa', 'Gomez', '6500.00'),8
('Gwendolyn', 'James', '4200.00'),9
('Simon', 'Collins', '3320.00'),10
('Taylor', 'Martin', '1500.00'),11
('Andrew', 'Thompson', '2100.00');