Oracle Equivalent queries in Postgres

Hello,
I am checking the compatibility of my product with Postgres database and
i stucked in forming the below oracle equivalent queries in Postgres
database, Could some one help me pleaseee

1) Trying to get index and corresponding columns information of all the
tables in mentioned schema

select inx.table_name as table_name, inx.index_name as
index_name,column_name, case ( when inx.index_type = 'IOT - TOP' then
'Y' else 'N' end,
case
when inx.uniqueness = 'UNIQUE' then 'Y'
when inx.uniqueness = 'NONUNIQUE' then 'N'
end,
'N' as ignore_dup_key,
cast(inc.column_position as NUMBER(10))
from all_indexes inx,
all_ind_columns inc
where inx.owner = '" + database.toUpperCase() + "'
and inx.table_name = inc.table_name
and inx.index_name = inc.index_name
and inx.owner = inc.index_owner
and inx.owner = inc.table_owner
and inx.dropped = 'NO'
and inx.table_name = '" + tableName.toUpperCase() + "'
order by inx.table_name, inx.index_name, cast(inc.column_position
as NUMBER(10))

2) Trying to get the columns information of all the tables in mentioned
schema

select tab.TABLE_NAME,
col.COLUMN_NAME,
col.DATA_TYPE,
cast(case when col.CHAR_COL_DECL_LENGTH is NULL then
col.DATA_PRECISION else col.CHAR_LENGTH end as NUMBER(10)),
cast(col.NULLABLE as CHAR(1)),
cast(col.COLUMN_ID as NUMBER(10))

from all_tab_columns col,
all_tables tab
where tab.TABLE_NAME = col.TABLE_NAME
and tab.OWNER = col.OWNER
and tab.OWNER = '" + database.toUpperCase() + "'
and tab.DROPPED = 'NO'
and tab.TABLE_NAME = '" + tableName.toUpperCase() + "'
order by tab.TABLE_NAME, cast(col.COLUMN_ID as NUMBER(10))

*Sivannarayanareddy Nusum****| **System Analyst(Moneta GDO)*

Subex Limited, Adarsh Tech Park, Outer Ring Road, Devarabisannalli,
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