In SQL Server, the FOR XML clause allows us to return the results of a query as an XML document. Simply by placing the FOR XML clause at the end of the query will output the results in XML.
When we do this, we have the option of specifying RAW, AUTO, EXPLICIT, or PATH mode. These modes allow us to shape the resulting XML in different ways, and so the mode we choose will determine how the XML is generated.
Below are examples of using PATH mode when generating XML from a SQL query.
In Redis, the ZMSCORE command allows us to get the score of one or members in a sorted set.
When creating a table with SQL, we can specify that the table is only to be created if it doesn’t already exist. Doing this prevents any errors from occurring in the event that the table already exists.
Here are some examples of doing this in various RDBMSs.
Continue readingIf you get an error that reads “WRONGTYPE Operation against a key holding the wrong kind of value” when using the ZINTER command in Redis, it’s probably because you’re passing a key with the wrong data type.
To fix this issue, be sure that each key you pass to the ZINTER command is either a set or a sorted set.
Below is a list of binary styles supported by the CONVERT() function in SQL Server. These are the styles that can be used as the third argument to indicate how the input value is formatted when converting to binary.
We can use these styles when the input expression is binary(n), char(n), varbinary(n), or varchar(n).
Continue readingBelow is a list of XML styles supported by the CONVERT() function in SQL Server. These are the styles that can be used as the third argument to indicate how the input value is formatted when converting to XML.
Below is a list of date & time styles supported by the CONVERT() function in SQL Server. These are the styles that can be used as the third argument to indicate how the input value is formatted.
Below is a list of numeric styles supported by the CONVERT() function in SQL Server. These are the styles that can be used as the third argument to indicate how the input value is formatted.
Starting with Redis 6.2.0, the ZRANGE command added the REV, BYSCORE, BYLEX and LIMIT options. The addition of the first three options means that the ZRANGE command can now do what the ZREVRANGE, ZRANGEBYSCORE, ZREVRANGEBYSCORE, ZRANGEBYLEX and ZREVRANGEBYLEX commands can do.
As a result, those commands are now deprecated (as of Redis 6.2.0).
Therefore, we should no longer use the ZREVRANGEBYLEX command. Instead, we should use the ZRANGE command with the BYLEX and REV arguments.
In Redis, the ZSCORE command returns the score of the specified member of a sorted set.