I have had a deeper look on this issue: on windows platform the ide install files contain chm help files dated at august 2012, where sqldb with all the actual packages seems not contained.
So I have downloaded actual chm help files and they now contain the sqldb documentation, so it works now.
Should I report this as a bug, so the maintainers can update the help files in the official win installation package of lazarus?
Under OS X I get it not working: now the lhelp app crashes each time I press F1 in lazarus with the following error message: "lhelp Stream read error. Press OK to ignore and risk data corruption. Press Cancel to kill the program."
I don't really know, what I have changed that causes this crash...
I have reinstalled the Lazarus IDE package and tried to delete the profile directory in users home directory (.lazarus), but it all doesn't help...
Any idea?!
Thanks
Markus