You’ll also see that these anti-patterns stem from performance concerns and that, besides the “manual” approach to improving SQL queries, you can analyze your queries also in a more structured, in-depth way b
Start by downloading one of these options, then talk to your company’s IT department about how to connect to your database. Your option will depend on your product's back end, so check with your product team to ensure you select the correct one. To learn how to write an SQL query, ...
Having the overall picture will spare you a lot of time in the long-run, so invest some time when you’re starting. Let’s Start with the Complex Query In case I spent too many words so far, let’s remind ourselves of the original question –“How to write a complex SELECT query?
Time to complete a query can be a problem. There is no defined maximum for the number of WHEN conditions you can have within a CASE WHEN statement. CASE WHEN queries can become very slow because the query has to check each condition for every row until it finds a case where it satisfies...
When you write Passthrough SQL statements and Range Where clauses in Dexterity, make sure that the Transact SQL code is compatible with all regional settings and sort orders. Also, make sure that field values that are passed to Microsoft SQL Server are handled correctly. You can use the ...
WHERE (Counts >0 and [Key] like CASE WHEN HasRange =1 THEN ExceptionRange ELSE ExceptionSignature END and 1= CASE WHEN HasRange =0 THEN 1 WHEN Exception like N'%~%' THEN [FN_PartCheckRange](PortionMapIds,Exception,PortionNumbers,FromValue,ToValue) ...
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”- Gail Shaw For fast, accurate and documented assistance in answering your questions, please readthis article. ...
It is quite a misery for the users to export MDF to SQL Scripts file in case users aren’t aware of the technicalities issues. Therefore, they often end up losing their crucial data files. Now, the question arises why it is important & what are the authentic ways to do so. ...
In that case, we replace the description with the product name. The following query uses CASE to convert long descriptions to NULL, then uses COALESCE() to fallback to the product name. SELECT DISTINCT product_name, description, COALESCE( CASE WHEN LENGTH(description) >= 60 THEN NULL ELSE ...
separating statements onto multiple lines so each line contains only one clause. This aimed to make each example more readable and understandable, but be aware that as long as you don’t include any syntax errors you can write any query on a single line or on as many lines as you’d ...