That said, what DOES matter to me is the loss of the Designer-First approach. It was an elegant place to construct an architecture that attended to both OO and relational concerns. Strict "Code-First" just makes no sense to me. By that, I mean, designing and creating a performance-...
Today we’ll be talking about: what is NOLOCK, and what are the dirty secrets, as well as some other aspects to it. What does NOLOCK mean and when do we use it? NOLOCK is a table hint in SQL Server The word NOLOCK itself is a shorthand code, because we have this table hint, ...
What does it mean that BACKUP TABLE / RESTORE TABLE are not "yet" implemented? 文章 20/02/2008 Say you are one of those users who have been using SQL Server since 6.x days. And say you remember that in those versions there was the possibility to backup or...
This is similar to the TSQL IN operator commonly used to specify multiple values in a WHERE clause. Previously, it was common to specify multi-value filters using the logical OR operator, like in the following measure expression: DAX Copy Filtered Sales:=CALCULATE ( [Internet Total Sales], ...
This is similar to the TSQL IN operator commonly used to specify multiple values in a WHERE clause. Previously, it was common to specify multi-value filters using the logical OR operator, like in the following measure expression: DAX Copy Filtered Sales:=CALCULATE ( [Internet Total Sales], ...
This would mean that you would not be able to add transactions by employees who were not in the Employee table. NULL or NOT NULL. NULL is the absence of data. If a column was “NOT NULL” then you would have to add data into that column when you create a new row or update an ...
This question came up during the discussion. Does high wait in SOS_SCHEDULER_YIELD as shown insys.dm_os_wait_statsindicate an underlying CPU performance problem? Answer: it depends if high count or high wait? To keep a single executing thread from taking 100% CPU, our code automatically reli...
Unfortunately, the notation falls short again for similar reasons. While it helps us determine the type of the variable, does the type really even matter? We?re still adding redundancy and length, and we?re reducing readability in a condition where type checking isn?t even required. When we...
That's the way most people WANT it to work. You have to understand that NULL means nothingness. There is nothing to compare, so NULL can't be used as part of the constraint, because there isn't anything there. Null doesn't mean null, null really means nonexist...
OR '2011/10/12' or anything with slashes, hyphens, or colons. It is interpreted by the engine and stored as described earlier. The point is, changing the format of how you are requesting or inputting the date does not change performance or ...