You can write regular SQL Server queries here, for example:
SELECT * FROM "Users" u WHERE u.name LIKE '%John%'
You can add params to your query by naming them $variable. When you use this query in the frontend, you can dinamically fill the parameters:
SELECT * FROM "Users" u WHERE u.name = $variable_name
INSERT INTO "Users"(name, email) VALUES ($name,$email)
UPDATE "Users" SET name = $name WHERE u.email = $email
DELETE FROM "Users" WHERE u.email = $email