In PostgreSQL, we can use the extract() function along with the epoch argument to return the Unix timestamp.
We can return the Unix timestamp based on the current date/time, or we can get it based on another specified date/time.
Continue readingAuthor: Ian
2 Ways to Get the Number of Days in a Month in Oracle
Here are a couple of ways to return the number of days in a given month in Oracle Database. This could be the number of days in the current month, or the number of days in a month based on a specified date.
Continue reading2 Ways to Return Rows that Only Contain Non-Alphanumeric Characters in MariaDB
Below are two methods for returning rows that contain only non-alphanumeric characters in MariaDB.
Non-alphanumeric characters include punctuation characters like !@#&()–[{}]:;',?/* and symbols like `~$^+=<>“, as well as whitespace characters like the space or tab characters.
Subtract Days from a Date in SQLite
In SQLite, we can use the DATE() function to subtract one or more days from a date.
For datetime values, we can use the DATETIME() function.
Return the Number of Days in a Month in MariaDB
Here’s a nifty trick we can use in MariaDB to return the number of days in a month based on a given date.
Continue readingFix “INSERT has more expressions than target columns” in PostgreSQL
If you encounter an error that reads “INSERT has more expressions than target columns” when trying to insert data in Postgres, it’s because you’re trying to insert data into more columns than the table actually contains.
Continue reading3 Ways to Get the First Day of the Month in SQL Server
Below are three options for using T-SQL to return the first day of the month in SQL Server.
This could be the first day of the current month, or the first day of a month based on a given date.
Continue readingSubtract Minutes from a Time Value in PostgreSQL
In PostgreSQL, we can use the - operator to subtract one or more minutes from a time value.
By “time” value, this could be an actual time value, a timestamp, or an interval. We can also subtract minutes from a date value or a date and time combination.
Fix “date is incompatible with int” in SQL Server when Adding to or Subtracting from a Date
If you’re getting error message “Msg 206” that reads “Operand type clash: date is incompatible with int” in SQL Server while trying to add to (or subtract from) a date, it’s probably because you’re trying to perform arithmetic between an integer and a date value.
To fix this issue, either change the date value to a datetime value or use the DATEADD() function.
How to Get Values That Don’t Contain Numbers in SQL Server
If you have a column in a SQL Server database table that contains character data, but some rows also contain numbers within that data, you can use the following technique to return just those rows that don’t contain numbers.
Numbers can be represented by words and other symbols, but for the purpose of this article, “number” means “numerical digit”. So we’re finding values that don’t contain any numerical digits.
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