How find an value in to all table postgress - mysql

Question

Suppose to have this word 'student' , I need to return all tables that contains the 'student' word. I need something like this:
select *
from information_schema.tables t
where column ='student';
Anyone can help me?

Answer 1

If you want tables, you would use:
select *
from information_schema.tables t
where table_name like '%student%';
If you want columns, you would use the right metadata table and use:
select *
from information_schema.columns c
where column_name like '%student%';

Answer 2

So you want to find the string 'students' or any version thereof in the database. Well there is no simple query that will give you that. So what you need to to select from the information schema all columns names having a string type definition and with those build a query for every column. The routine to do that is not overly complex or large providing you need only standard columns types. That no user defined types, no JSON(B), XML, or hstore types. You can try:
do $$
declare
k_sql_base constant text = $stmt$
select '%1$s' table_schema,'%2$s' table_name,'%3$s' column_name
from %1$I.%2$I where lower(%3$I) like '%4$s' limit 1;
$stmt$;
k_search_text text = '%students%';
c_text_cols cursor for
select col.table_schema
, col.table_name
, col.column_name
from information_schema.columns col
where col.data_type in ('text', 'character varying')
and col.table_schema not in ('pg_catalog', 'information_schema');
l_table_rec record;
l_search_stmt text;
begin
for l_table_rec in c_text_cols
loop
l_search_stmt = format(k_sql_base
,l_table_rec.table_schema
,l_table_rec.table_name
,l_table_rec.column_name
,k_search_text
) ;
execute l_search_stmt into l_table_rec;
if l_table_rec.table_schema is not null then
raise notice 'Found in: %.%.%',l_table_rec.table_schema
,l_table_rec.table_name
,l_table_rec.column_name;
end if;
end loop;
end;
$$;