First of all, never start a new thread by choosing reply to an old
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> Index definition for lower case:
> ALTER TABLE "sys_company" ADD CONSTRAINT "pk_sys_company" PRIMARY KEY
> ("com_id");

> Index definition for upper case
> ALTER TABLE SYSCOM ADD CONSTRAINT PK_SYSCOM PRIMARY KEY (COMNUM);

> I wonder why for lower case I have "" for names ?????

By default Firebird use case insensitive table and field names, and
store them in upper case. Hence, sys_company, Sys_Company and
SYS_COMPANY are all identical. You can make them case sensitive by
putting them in double quotes, and hence "sys_company" isn't equal to
any of the three names above (not even sys_company). However, case
sensitive indexes all uppercased are stored and treated the same way
as case insensitive indexes. So, "SYS_COMPANY" is identical to
sys_company, but both of these are different to "sys_company".
Confused yet?

HTH,
Set