Does it make a difference if you do count(*) vs count(column-name) as in these two examples?I have a tendency to always write count(*) because it seems to fit better in my mind with the notion of it being an aggregate function, if that makes sense. But I'm not sure if it's ...
What Does the COUNT() Function do? TheCOUNT()function counts. But what does it count? TheCOUNT()function belongs to SQL’saggregate functions. It counts the number of rows that satisfy the criteria defined in the query. It does not return the rows themselves; it shows the number of rows...
In some cases, the Database Engine can choose to do a wide plan update. This trace flag forces a narrow plan update.Scope: Global or session or query (QUERYTRACEON). 2340 Causes SQL Server not to use a sort operation (batch sort) for optimized Nested Loops joins when generating a pla...
in elem [not] in (query) Returns true if elem does (not) equal any row in query. is distinct expr1 is [not] distinct from expr2 Tests whether the arguments do (not) have different values where NULLs are considered as comparable values. is false expr is [not] false Tests whe...
'IF EXISTS(SELECT COUNT(1))' VS 'IF EXISTS(SELECT 1) ' 'Incorrect syntax near' error while executing dynamic sql 'INSERT EXEC' within a function did not work 'Sort' in exuction plan is showing more than 90 % cost, what to do? 'TRY_CONVERT' is not a recognized built-in function...
Data skew is a common issue during the execution of SQL jobs. When data is unevenly distributed, some compute nodes process significantly more data than others, which can
This is often the first thing you want to do on an account aws_budget_alarm.sh - creates an AWS Budgets billing alarm and SNS topic with subscription to email you when both when you start incurring forecasted charges of over 80% of your budget, and 90% actual usage. This is often ...
What do I need to focus on when I use built-in functions? Use built-in functions to replace user-defined functions (UDFs) Built-in functions of Realtime Compute for Apache Flink are under continual optimization. We recommend that you replace UDFs with built-in functions if possible. Real...
[Send Mail Task] Error: Either the file "///ServerName//Transfer//Reporting//Completed" does not exist or you do not have permissions to access the file. [Solved] Refresh excel sheets inside SSIS [SQL Server Destination [100]] Error: Unable to bulk copy data. You may need to run this...
Nested Subquery: This can be placed anywhere in the outer query and does not directly reference the outer table. Basic SQL Interview Questions 18. What is a function in SQL, and why do we use functions? A function is a database object that encapsulates a set of SQL statements that perfo...