Standard SQL query functions used by SQL plugins packages for the 'TSdbi' interface to time series databases. It will mainly be used by other packages rather than directly by end users. The one exception is the function 'TSquery' which can be used to construct a time series from a database containing observations over time (e.g. balance statements for multiple years), but where the database is not specifically designed to store time series (as with other 'TSdbi' SQL plugin packages). Comprehensive examples of all the 'TS*' packages is provided in the vignette Guide.pdf with the 'TSdata' package.