Hi! We are facing a problem with MERGE Tables. We have a process in php which connects to the DB using the mapi ( https://www.monetdb.org/Documentation/Manuals/SQLreference/Programming/MAPI https://www.google.com/url?q=https%3A%2F%2Fwww.monetdb.org%2FDocumentation%2FManuals%2FSQLreference%2FProgramming%2FMAPI&sa=D&sntz=1&usg=AFQjCNGpR9jSaQKxbmqRuVF8krphUQBn1g ) The process creates a new table everyday as follows: CREATE TABLE cub8_20160717 AS (SELECT * FROM cub8) WITH NO DATA; Then, attaches that new table to the MERGE table called cub8_cubo as follows: ALTER TABLE cub8_cubo ADD TABLE cub8_20160717 ; Once all this is created, it start inserting data. Everything works fine, with NO errors. BUT if I run a query against cub8_cubo I dont see cub8_20160717 data. So I run this query in order to check if the new table was attached to the merge: SELECT a.name, b.name, s.name FROM sys.tables as a JOIN sys.dependencies d ON a.id = d.depend_id JOIN sys.tables as b ON b.id= d.id JOIN sys.schemas as s ON a.schema_id = s.id WHERE a.type= 3 AND a.name ILIKE '%cub8%' ORDER BY 1,2; +-----------+---------------+ | name | name | +===========+===============+ | cub8_cubo | cub8_20160710 | | cub8_cubo | cub8_20160711 | | cub8_cubo | cub8_20160712 | | cub8_cubo | cub8_20160713 | | cub8_cubo | cub8_20160714 | | cub8_cubo | cub8_20160715 | | cub8_cubo | cub8_20160716 | | cub8_cubo | cub8_20160717 | So I try to detached from cub8_cubo, with the command: ALTER TABLE cub8_cubo DROP TABLE cub8_20160717; ALTER TABLE: table 'sb_traf.cub8_20160717' isn't part of the MERGE TABLE 'sb_traf.cub8_cubo' So I ADD it again: ALTER TABLE cub8_cubo ADD TABLE cub8_20160717; and now yes... I can see the data. If I need to detach that table, I need to run ALTER ... DROP twice or three times to get it done. It seems to be a bug?, are we doing something wrong ?? Thks in advance! *PS.:We are using * *MonetDB Database Server v1.7 (Jun2016)* *Welcome to mclient, the MonetDB/SQL interactive terminal (Jun2016)*