================================================================================================
additional command-line arguments in vdb-sql:
================================================================================================
-acc SRRXXXXXX  ... create a virtual VDB-table named VDB
-tbl XXX        ... use table XXX instead of SEQUENCE
-col C1;C2;C3   ... semicolon-separated list of columns to open instead of all columns
-exclude C5     ... semicolon-separated list of columns to exclude of -col was not given
-cache XXXX     ... size of cursor-cache ( dflt. 32 MB )

see example1.sh ... example6.sh for usage!


================================================================================================
syntax for creation of virtual table via SQL-statement:
================================================================================================
create virtual table NAME using vdb( ACC );

NAME ... can be chosen like VDB, VDB1, etc
ACC .... mandatory argument: the accession to be opened

example:

create virtual table VDB using vdb( SRR341578 );

-------------------------------------------------------------------------------------------------------
table/T ..... table to be opened ( if accession is a database, and a specific table is requested )

example:

create virtual table VDB using vdb( SRR341578, table = PRIM );
or
create virtual table VDB using vdb( SRR341578, T = PRIM );

note: The table name can be shortened for convenience. In this case PRIMARY_ALIGNMENTS has been
      shortened to PRIM. The shortened name has to avoid ambiguity.



-------------------------------------------------------------------------------------------------------
columns/C ... specific set of columns to be opened ( if ommited all readable columns will be opened )

example:

create virtual table VDB using vdb( SRR341578, columns = READ;(INSDC:quality:text:phred_33)QUALITY );
or
create virtual table VDB using vdb( SRR341578, C = READ;(INSDC:quality:text:phred_33)QUALITY );

note: The list of columns has to be separated by semicolons. A column can be prefixed by a type-cast.



-------------------------------------------------------------------------------------------------------
exclude/X ... set of columns to be excluded ( if no set of columns has been given )

example:

create virtual table VDB using vdb( SRR341578, exclude = NAME );
or
create virtual table VDB using vdb( SRR341578, X = NAME );

note: This opens all readable columns, except the NAME-column. If more than one column is to be
      excluded, than the list has to be separated by semicolons.


-------------------------------------------------------------------------------------------------------
cache ... size of cursor-cache ( if ommited the cursor-cache uses 32 MB of RAM )

example:

create virtual table VDB using vdb( SRR341578, cache = 1000000 );

note: The cache is reduced to 1 MB of RAM.