If you’re using a T-SQL function such as OPENJSON(), JSON_QUERY(), or JSON_VALUE(), you might be wary of any non-alphanumeric characters that might be in the JSON document that you’re working with. Especially if those special characters are in the key names, and you need to reference those key names.
Category: DBMS
Database Management Systems
How ADDTIME() Works in MariaDB
In MariaDB, ADDTIME() is a built-in date and time function that adds an amount to a time or datetime expression.
It allows you to change a time or datetime expression by passing that expression, as well as a time expression to add to that expression. You can pass a negative amount if you need to subtract from the time expression.
Continue readingHow SUBTIME() Works in MariaDB
In MariaDB, SUBTIME() is a built-in date and time function that subtracts an amount from a time or datetime expression.
It allows you to change a time or datetime expression by passing that expression, as well as a time expression to subtract from that expression. You can pass a negative amount if you need to add to the time expression.
Continue readingMariaDB Date and Time Units
Below is a full list of the date and time units that can be used in MariaDB.
Continue readingHow SUBDATE() Works in MariaDB
In MariaDB, SUBDATE() is a built-in date and time function that subtracts an amount from a given date.
It allows you to change a date by specifying the date, the unit to subtract, and the amount to subtract. You can pass a negative amount in order to add to the date, instead of subtracting from it.
SUBDATE() also has a shortcut syntax that allows you to specify the days to subtract.
How DATE_SUB() Works in MariaDB
In MariaDB, DATE_SUB() is a built-in date and time function that allows you to subtract an amount from a date.
It allows you to change a date by specifying the date, the unit to subtract, and the amount to subtract. You can pass a negative amount in order to add to the date, instead of subtracting from it.
Continue readingHow ADDDATE() Works in MariaDB
In MariaDB, ADDDATE() is a built-in date and time function that performs date arithmetic.
It allows you to change a date by specifying the date, the unit to add, and the amount to add. You can pass a negative amount if you need to subtract the date by a certain interval.
ADDDATE() also has a shortcut syntax that allows you to add a given number of days to the date.
How DATE_ADD() Works in MariaDB
In MariaDB, DATE_ADD() is a built-in date and time function that performs date arithmetic.
It allows you to change a date by specifying the date, the unit to add, and the amount to add. You can pass a negative amount if you need to subtract the date by a certain interval.
Continue reading3 Ways to Hide an Index from the Query Plan in MongoDB
Starting from MongoDB 4.4, we can now hide indexes from the query plan. This enables us to evaluate the potential impact of dropping an index without actually dropping the index.
If hiding it has a negative impact, we can unhide the index. This saves us from having to drop the index, then recreate it again.
Below are 3 ways to hide an index in MongoDB.
Continue readingOPENROWSET does not accept variables for its arguments (SQL Server)
If you’re trying to use OPENROWSET to run an ad hoc distributed query in SQL Server, but you keep getting an “incorrect syntax” error, and you just can’t see anything wrong with your syntax, it could be that you’re trying to use a variable for one of the arguments.
As mentioned in the title of this post, OPENROWSET does not accept variables for its arguments.
If you’re using variables as arguments, try changing these to string literals.
Continue reading