In SQLite, the degrees() function is used to convert an angle from radians to degrees. In trigonometry, angles are commonly measured in either radians or degrees, and this function helps to easily switch from one unit to the other.
Fix “Violation of PRIMARY KEY constraint” in SQL Server (Error 2627)
If you’re getting an error that reads something like “Violation of PRIMARY KEY constraint ‘PK_CatId’. Cannot insert duplicate key in object ‘dbo.Cats’. The duplicate key value is (1)” in SQL Server, it’s because you’re trying to insert a duplicate value into a primary key column.
A primary key cannot contain duplicate values.
To fix this issue, you’ll need to change the value you’re trying to insert into the primary key column.
Continue readingHow the SIN() Function Works in SQLite
In SQLite, the SIN() function calculates the sine of an angle specified in radians.
This is a fundamental trigonometric function that returns a value between -1 and 1, representing the ratio of the opposite side to the hypotenuse in a right triangle.
Continue readingHow to Create an Index in SQLite
In database management systems (DBMSs) such as SQLite, indexes can be used to optimize the performance of queries, especially for larger datasets where querying can become time-consuming. An index allows the database to locate rows more quickly without scanning every row in a table.
This article explains how to create an index in SQLite, along with a simple example.
Continue readingUnderstanding the LOG2() Function in SQLite
The log2() function in SQLite calculates the base-2 logarithm of a given number.
This function can be useful for scenarios such as binary calculations, information theory, or situations where the base-2 logarithm is needed.
Continue readingGet the IDENTITY Values that were Generated by an INSERT Statement in SQL Server
The good thing about having IDENTITY columns in SQL Server is that they automatically generate a unique value for every row that’s inserted into a table. This saves us from having to insert our own unique values, and I’m not going to complain about that.
But obvious question you might ask; What if I need to know the value that was generated for each column I just inserted?
Fortunately, the solution may be easier than you think!
Continue readingA Quick Look TANH() in SQLite
The tanh() function in SQLite calculates the hyperbolic tangent of a number.
The hyperbolic tangent is the ratio of hyperbolic sine to hyperbolic cosine, producing values between -1 and 1.
Continue readingUnderstanding the TRUNC() Function in SQLite
The SQLite TRUNC() function is used to truncate a number to an integer. It returns the integer part of its argument rounding toward zero.
TRUNC()is similar to CEIL() and FLOOR(), except that TRUNC() always rounds toward zero. CEIL() on the other hand, always rounds up, and FLOOR() always rounds down.
Fix Error 137 “Must declare the scalar variable” in SQL Server
If you’re getting SQL Server error 137 that goes something like “Must declare the scalar variable…“, it’s probably because you’re referring to a variable that hasn’t been declared.
If the variable has been declared, it’s possible you’re referring to it incorrectly in the code.
When we use a variable in SQL Server, we must declare the variable first.
To fix this issue, declare the variable. Also be sure to use the right syntax when using it.
Continue readingOverview of LOG() in SQLite
The LOG() function in SQLite calculates the logarithm of a given number to a specified base, with 10 being the default base.
This is helpful for logarithmic transformations or calculations requiring a specific base (e.g., base 10 for common logarithms or base 2 for binary logarithms).
Continue reading