Database Management Systems
If you’re getting an error that reads “Parse error: all VALUES must have the same number of terms” in SQLite when using the VALUES clause as a stand alone statement, it’s probably because you’re not providing the same number of columns in all rows.
When we use VALUES to create a constant table, we must provide the same number of columns in each row.
To fix this issue, be sure to provide the same number of columns across all rows.
Continue readingIf you’ve ever used the VALUES clause as a stand alone statement, you may have noticed that SQLite provides default column names for the results. SQLite conveniently names them column1, column2, and so on.
However as convenient as this is, you might want to provide names that are more meaningful.
Fortunately there’s an easy way to do that.
Continue readingIf you’re getting error 10753 when using a window function in SQL Server, it’s probably because you’re calling the function without an OVER clause.
When using the DENSE_RANK() function, the error message reads “The function ‘DENSE_RANK’ must have an OVER clause”.
The DENSE_RANK() function requires an OVER clause (and that clause must have an ORDER BY clause).
To fix this issue, add an OVER clause to the DENSE_RANK() function.
If you’re getting an error that reads ‘Parse error: near “ORDER”‘ in SQLite, it could be that you’re trying to use the ORDER BY clause when using the VALUES clause as a stand alone statement.
Although we can certainly use the VALUES clause as a stand alone SQL statement, we can’t apply the ORDER BY clause against it.
However all is not lost. Below is an example of how we can sort the results of the VALUES statement.
Some database management systems, including SQLite, allow us to use the VALUES keyword as a stand alone SQL statement. So we can use VALUES to return a constant table, usually with less code than would be required if we were to use the SELECT statement.
The following examples demonstrate how.
Continue readingIf you’re getting an error that reads “‘GENERATE_SERIES’ is not a recognized built-in function name” in SQL Server, it could be that you’re calling GENERATE_SERIES() in the wrong context.
In SQL Server, GENERATE_SERIES() is a relational operator that returns a series of values from a given start and stop point.
When we call GENERATE_SERIES() in a SQL query, we don’t include it in the SELECT list, like we would with many SQL functions. Instead, we reference it in the FROM clause, like we would reference a table.
So if you’re getting the above error, it could be that you’re inadvertently making this mistake. To fix, be sure to call GENERATE_SERIES() in the correct context.
Many of us who work with SQL databases have used the VALUES keyword with the INSERT statement when inserting data into a database.
But perhaps a lesser known fact is that some RDBMSs allow us to use VALUES as a stand alone SQL statement. PostgreSQL is one such RDBMS.
When used as a stand alone statement, we can use a VALUES statement instead of a SELECT statement.
SQL Server 2022 introduced a bunch of new bit manipulation functions and operators. Amongst these are the right shift and left shift operators.
The right shift and left shift operators can be used to shift bits to the left or right. Given an integer or binary expression, these operators can shift bits by the amount that we specify.
Continue readingIf you’re getting error message 4112 that reads “The function ‘CUME_DIST’ must have an OVER clause with ORDER BY” when using the CUME_DIST() function, it’s probably because you’re omitting the ORDER BY clause from the OVER clause.
When using the CUME_DIST() function in SQL Server, we must include an OVER clause that contains an ORDER BY clause. This error happens when we provide the OVER clause but not the ORDER BY clause.
To fix this error, add an ORDER BY clause to the OVER clause.
In SQL Server, we can use the GET_BIT() function to return the bit from the specified location in a value. We pass the value as either an integer or binary expression.
The function accepts two arguments; the expression, and the offset. The function then returns the bit from the given offset in the expression.
Continue reading