Drop all tables db2

select 'drop index "' || TRIM(INDSCHEMA) || '"."' || TRIM(INDNAME) || '";'
  from SYSCAT.INDEXES
  where UNIQUERULE = 'D'
  and INDSCHEMA = (select current schema from SYSIBM.SYSDUMMY1);

select 'alter table "' || TRIM(TABSCHEMA) || '"."' || TRIM(TABNAME) || '" drop foreign key "' || TRIM(CONSTNAME) || '";'
  from SYSCAT.TABCONST
  where TYPE = 'F'
  and TABSCHEMA = (select current schema from SYSIBM.SYSDUMMY1)

select 'alter table "' || TRIM(TABSCHEMA) || '"."' || TRIM(TABNAME) || '" drop unique "' || TRIM(INDNAME) || '";'
  from SYSCAT.INDEXES
  where UNIQUERULE = 'U'
  and INDSCHEMA = (select current schema from SYSIBM.SYSDUMMY1);

select 'alter table "' || TRIM(TABSCHEMA) || '"."' || TRIM(TABNAME) || '" drop primary key;'
  from SYSCAT.INDEXES
  where UNIQUERULE = 'P'
  and INDSCHEMA = (select current schema from SYSIBM.SYSDUMMY1);

select 'drop table "' || TRIM(TABSCHEMA) || '"."' || TRIM(TABNAME) || '";'
  from SYSCAT.TABLES
  where TYPE = 'T'
  and TABSCHEMA = (select current schema from SYSIBM.SYSDUMMY1);

select 'drop view "' || TRIM(TABSCHEMA) || '"."' || TRIM(TABNAME) || '";'
  from SYSCAT.TABLES
  where TYPE = 'V'
  and TABSCHEMA = (select current schema from SYSIBM.SYSDUMMY1);

Source: stackoverflow.com

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