How to concate rows as single column in derby - derby

I use listagg function in Oracle to concate rows in Oracle.
Example: tables is
Username
Abc
Xyz
Pqr
After using listagg in Oracle I get result as
Abc,Xyz,Pqr
But not able to create same result in derby. What could be query to get same result

Related

DESCRIBE TABLE equivalent in CockroachDB?

I tried using Oracle's DESCRIBE TABLE... statement in CockroachDB and got a syntax error. What’s the equivalent command?

In CockroachDB, the SHOW COLUMNS statement returns information about the columns in a table, similar to the DESCRIBE statement in MySQL and the \d command in PostgreSQL:
SHOW COLUMNS FROM tablename;
You can also get some information by running SHOW INDEX or SHOW CREATE TABLE or by querying the information_schema database.

Concat_ws not working in insert statement in hive

Using hive, I'm trying to concatenate columns from one table and insert them in another table using the query
insert into table temp_error
select * from (Select 'temp_test','abcd','abcd','abcd',
from_unixtime(unix_timestamp()),concat_ws('|',sno,name,age)
from temp_test_string)c;
I get the required output till I use Select *. But as soon as I try to insert it into the table, it does not give concatenated output but gives the value of sno only instead of whole concatenated output.

Thanks guys.
I found why it was behaving that way. It's because while creating table I gave "separate fields by '|'". So what I was trying to insert as a string into the table, hive was interpreting it as different columns.

how to extract tables attributes like column name , datatype ,nullable for all the tables from the database from oracle pl/sql

Is there any query that can be used to retrive the Tables and its column attributes like column name , datatype, nullable etc for all the tables inside the database
For Oracle Pl/SQL

The Oracle SQL you need would be the following (run as user 'SYS'):
select owner, table_name, column_name, data_type, nullable
from dba_tab_columns;
If you do a desc dba_tab_columns you will get a list of many more columns which may be of interest to you as part of your result set.
You can use a SQL tool (i.e. SQL*Plus) to run this query or you can use PL/SQL to call this query and put the results in PL/SQL variables then print them out via DBMS_OUTPUT.PUT_LINE().
HTH

How to have the list of table in a monetdb database?

In postgresql, one can have all tables names by running the following query
SELECT table_name FROM information_schema.tables WHERE table_schema='public';
Is there something similar in monetdb to have the list of tables ?

I finally find this query
select tables.name from tables where tables.system=false ;

If you are using mclient, in the command line you could simply use the command "\d" to list all the tables in the current database.
sql> \d
TABLE sys.table1
TABLE sys.table2
TABLE sys.table3
Additionally, use the command "\d tablename" to view the metadata of a table - equivalent to "show create table" in mysql.

Convert ntext to clob

I have to copy data from one table to another which one table is in Oracle and one is in MSSQL Server. I want to copy the data from MSSQL Server table to Oracle table. The problem is that the MSSQL Server table has one column which is of data type ntext and the destination column in Oracle table is clob.
When I use the query
insert into oracle.table select * from sqlserver.table#mssql; I get the following error:
SQL Error: ORA-00997: illegal use of LONG datatype
Can anyone advice on this please?

I tried it through a PL/SQL Procedure and it worked. I created a cursor, passed in the values to my variables declared in VARCHAR2 and then run an EXECUTE IMMEDIATE for the INSERT INTO....SELECT * FROM <TABLE_NAME>#MSSQL.

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