The Isok Functions (Activating Isok)
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## The Isok Functions (Activating Isok)

Isok is run by using one of its functions. Of course the ISOK_RESULTS table may always be queried manually, but this does not discover any new problems.

All of the Isok functions are designed to be used in the FROM clause of SELECT statements, as if they were tables. Indeed the functions look like tables to the SELECT statement, tables that look exactly like ISOK_RESULTS -- except that the Resolved column is missing. The difference between querying on the ISOK_RESULTS table directly and querying using Isok's functions is that the functions update the content of the ISOK_RESULTS table by executing the the queries in ISOK_QUERIES table. Also, the functions never return rows where the underlying ISOK_RESULTS row has a non-`NULL` Resolved value or a Deferred_To time and date that has not yet been reached.

All timestamps, date plus time values, which Isok updates in the ISOK_QUERIES and ISOK_RESULTS tables are set to the date and time at which program execution started. So when, say, run_isok_queries(), is run, all of the new timestamp values in the ISOK_QUERIES and ISOK_RESULTS rows touched by the execution are identical.

Various Isok functions (or versions of the same function) are supplied to allow easy selection of which queries in which ISOK_QUERIES rows are to be executed, whether all or only some.

### Note

As with a regular table, the order in which rows are returned by Isok's functions is unspecified. If you wish to ensure a specific ordering an ORDER BY clause must be used.

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