SWITCH function doesn't work in access sql -

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with code below, i'm trying update table k_tables. column columntype doesn't have 0 or null values in it, after run script lot of null valued rows, , number of rows values (such bigint) larger expected. 

 update k_tables set  columntype = switch(                 columntype = 'i8' , 'bigint',                 columntype = 'i' , 'integer',                 columntype = 'cf' , 'character',                 columntype = 'd' , 'decimal',                 columntype = 'i1' , 'byteint',                 columntype = 'i2' , 'smallint',                 columntype = 'da' , 'date',                 columntype = 'ts' , 'timestamp',                 columntype = 'cv' , 'varchar'  );

is there wrong query?

what results of this?

select columntype, count(*) k_tables group columntype

my guess there values in there not mentioned in switch statement? these forced null switch gave no result.

i add clause...

update     k_tables set     columntype = switch(                      columntype = 'i8' , 'bigint',                      columntype = 'i' , 'integer',                      columntype = 'cf' , 'character',                      columntype = 'd' , 'decimal',                      columntype = 'i1' , 'byteint',                      columntype = 'i2' , 'smallint',                      columntype = 'da' , 'date',                      columntype = 'ts' , 'timestamp',                      columntype = 'cv' , 'varchar'                 )     columntype in ('i8','i', 'cf', 'd', 'i1', 'i2', 'da', 'ts', 'cv') ;

this mean update rows fit criteria, , leave other rows alone.


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