System variables

System variables provide an easy way to reference specific information about the system, the data being worked on, and the active user's session, among other useful pieces of information.

System variables are relevant in the vector context, such as in <willbe> and <sel> value expressions. System variables include the _ suffix to differentiate them from column names.


System variable	Description
`i_`	Row number in the current view
`i_(B)`	Sticky row number in current view `B` specifies a starting base number for the enumeration. The default is `1`.
`ii_(B)`	Enumeration of duplicate rows for each original row after performing a selection expansion (i.e., `<sel expand="1">`) `B` specifies a starting base number for the enumeration. The default is `1`.
`n_`	Number of rows in the current view
`n_()`	Sticky number of rows in the current view
`rn_`	Row number in the original table
`ri_`	Row index relative to segment in the original table
`zi_`	Virtual column of integer zeros
`zr_`	Virtual column of real zeros
`colord_`	The current column order of the worksheet or table
`dlpath_`	Path of directory where data is stored
`mach_`	Internal designation of server on which data is being processed
`name_`	Path of this table, or N/A if it is a tabulation or other virtual table
`orign_`	Number of rows in original table
`origname_`	Path of the original table (pre-tabulation)
`origtitle_`	Title of the original table (pre-tabulation)
`port_`	Internal designation of port number for process handling data
`rca_`	Takes on the result of processing all columns up to the current one, during the evaluation of certain row functions. (Available as of version 15.21)
`rcn_`	Takes on the name of each column successively during the evaluation of a row function
`rct_`	Takes on one of the string values (`'i', 'f', 'j', 'a', 'n'`) corresponding to the current column's basic data type: integer, float, bigint, string, or other, respectively, during the evaluation of a row function. (Available as of version 15.21)
`rcv_`	Takes on the value of each column successively during the evaluation of a row function
`seg_`	Segment in the original table
`subtitle_`	The subtitle of the worksheet currently being operated on
`title_`	Title of this table
`username_`	Username of user logged into current session
`verdate_`	The date the current version of MDB was released
`version_`	The MDB version number