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SELECT contact_id FROM your_table WHERE flag IN ('Volunteer', 'Uploaded', ...) GROUP BY contact_id HAVING COUNT(*) = 2 -- // must match number in the WHERE flag IN (...) list (assuming contact_id, flag is unique).
12 Οκτ 2024 · SELECT column1, column2, ... FROM table_name WHERE column_name operator (SELECT column_name FROM table_name WHERE condition ); We can understand subqueries as if the inner query is executed first, after which its results are used when executing the outer query. However, it’s important to note that, in practice, database query engines optimize ...
To filter data by multiple conditions in a WHERE clause, use the AND operator to connect the conditions. Here’s what this looks like for two conditions: WHERE condition1 AND condition2. In our example, condition1 is dept = 'Finance' and condition2 is salary > 4000.
In SQL Server, you can use multiple WHERE conditions to filter the results of a SELECT query based on specific criteria. This allows you to retrieve data that meets multiple requirements simultaneously.
I want to grab a value from a table into two different columns for different values from the same table. Use this query as an example (notice how the select is on the same table aliased as 2 different tables): a.otherVal = 100 AND. b.otherVal = 200 AND. a.id = b.id.
SELECT ID, Name, Boss, (SELECT Name FROM Employees WHERE ID IN (SELECT Boss FROM Employees)) FROM Employees But it gives me an error: "Subquery returned more than 1 value.
The SQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition. Example. Select all customers from Mexico: SELECT * FROM Customers. WHERE Country='Mexico'; Try it Yourself » Syntax. SELECT column1, column2, ... FROM table_name. WHERE condition;
