create-table

I am new to this SQL; I have seen similar question with much bigger programs, which I can't understand at the moment. I am making a database for games of cards to use in my homepage. I am using MySQL Workbench on Windows. The error I get is: Error Code: 1364. Field 'id' doesn't have a default value CREATE TABLE card_games ( nafnleiks varchar(50), leiklysing varchar(3000), prentadi varchar(1500), notkunarheimildir varchar(1000), upplysingar varchar(1000), ymislegt varchar(500), id int(11) PK ); insert into card_games (nafnleiks, leiklysing, prentadi, notkunarheimildir, upplysingar, ymislegt)

I'm creating a new table in Hive using: CREATE TABLE new_table AS select * from old_table; My problem is that after the table is created, It generates multiple files for each partition - while I want only one file for each partition. How can I define it in the table? Thank you! There are many possible solutions: 1) Add distribute by partition key at the end of your query. Maybe there are many partitions per reducer and each reducer creates files for each partition. This may reduce the number of files and memory consumption as well. hive.exec.reducers.bytes.per.reducer setting will define how

Is it possible to create n number of external tables are pointing to a single hdfs path using Hive. If yes what are the advantages and its limitations. It is possible to create many tables (both managed and external at the same time) on top of the same location in HDFS. Creating tables with exactly the same schema on top of the same data is not useful at all, but you can create different tables with different number of columns for example or with differently parsed columns using RegexSerDe for example, so you can have different schemas in these tables. And you can have different permissions on

I want to create a table in a SQLite database only if doesn't exist already. Is there any way to do this? I don't want to drop the table if it exists, only create it if it doesn't. From http://www.sqlite.org/lang_createtable.html : CREATE TABLE IF NOT EXISTS some_table (id INTEGER PRIMARY KEY AUTOINCREMENT, ...); 来源： https://stackoverflow.com/questions/4098008/create-table-in-sqlite-only-if-it-doesnt-exist-already

In a MySQL script you can write: CREATE TABLE IF NOT EXISTS foo ...; ... other stuff ... and then you can run the script many times without re-creating the table. How do you do this in PostgreSQL? This feature has been implemented in Postgres 9.1 : CREATE TABLE IF NOT EXISTS myschema.mytable (i integer); For older versions , here is a function to work around it: CREATE OR REPLACE FUNCTION create_mytable () RETURNS void AS $func$ BEGIN IF EXISTS (SELECT 1 FROM pg_catalog.pg_tables WHERE schemaname = 'myschema' AND tablename = 'mytable') THEN RAISE NOTICE 'Table myschema.mytable already exists.'