Common global variables in SQL

Select App_name () as W--Application for current session SELECT @ @IDENTITY--Returns the last inserted identity value Select USER_NAME ()--Returns the user database user name SELECT @ @CONNECTION S--Returns the number of connections or attempts to connect since the last SQL startup.  Select GETDATE ()--Current time SELECT @ @CPU_BUSY/100--Returns the working time of the CPU since the last SQL startup, in milliseconds use tempdb SELECT @ @DBTS as W--Returns the current The value of the timestamp data type. This timestamp value is guaranteed to be unique in the database. SELECT @ @IDENTITY as W--Returns the last inserted identity value SELECT @ @IDLE as W--Returns the time that SQL has been idle since the last startup, in milliseconds SELECT @ @IO_BUSY as W--returns SQL from the last boot The time of the input and output operations, in milliseconds SELECT @ @LANGID as W-Returns the local language identifier (ID) of the language currently in use. SELECT @ @LANGUAGE as W--returns the currently used language name SELECT @ @LOCK_TIMEOUT as W-the current lock timeout setting for the current session, in milliseconds. SELECT @ @MAX_CONNECTIONS As W-Returns the maximum number of simultaneous user connections allowed on SQL. The number returned does not have to be the value of the currently configured EXEC sp_configure--Displays the global configuration settings for the current server SELECT @ @MAX_PRECISION as W-returns the precision level used for the decimal and numeric data types, that is, the current Sets the precision. The default maximum precision is 38. SELECT @ @OPTIONS as W-returns information for the current SET option. SELECT @ @PACK_RECEIVED As W-Returns the number of input packets read from the network since SQL started. SELECT @ @PACK_SENT As W-Returns the number of output packets that have been written to the network since the last startup. SELECT @ @PACKET_ERRORS As W-Returns the number of network packet errors that occurred on the SQL connection since SQL startup. SELECT @ @SERVERNAME as W--Returns the name of the running SQL Server.  SELECT @ @SERVICENAME as W--Returns the registry key name under which SQL is running SELECT @ @TIMETICKS as W--the number of microseconds to return a SQL Server moment select @ @TOTAL_ERRORS as W--return The number of disk read/write errors encountered by the SQL Server since it was started. SELECT @ @TOTAL_READ As W-returns the number of times the SQL Server has read the disk since it started. SELECT @ @TOTAL_WRITE As W-returns the number of times the SQL Server has written to disk since startup. SELECT @ @TRANCOUNT As W-Returns the number of active transactions for the current connection.  SELECT @ @VERSION As W-Returns the date, version, and processor type of the SQL Server installation.