Question

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

Description of the steps you can take to speed up the query.
The optimal indexes for this query, which you can copy and create in your database.
An automatically re-written query you can copy and execute in your database.

The optimization process and recommendations:

Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.

Optimal indexes for this query:

CREATE INDEX inventorylocalizat_idx_language_code ON dbo.inventoryLocalization (language,code);

The optimized query:

SELECT
        i.[code],
        iL.[language],
        CASE 
            WHEN iL.[name] IS NULL THEN (SELECT
                iL2.name 
            FROM
                dbo.inventoryLocalization iL2 
            WHERE
                iL2.[language] = 'de' 
                AND iL2.code = i.[code]) 
            ELSE iL.[name] END AS [name] 
FROM
dbo.inventory i 
LEFT JOIN
dbo.inventoryLocalization iL 
    ON i.code = iL.code 
    AND iL.[language] = 'en'

How to optimize this SQL query?

The optimization process and recommendations:

Optimal indexes for this query:

The optimized query:

Related Articles