Such -journal files do not need to (and should not) be distributed. This is because the various journal files represent temporary data (ref. SQLite’s Use Of Temporary Disk Files) used by SQLite. In particular a -journal file is a rollback journal. A rollback journal is a temporary file used to implement atomic commit and rollback … Read more
In Microsoft SQL Server, VARCHAR is ASCII and NVARCHAR is Unicode (UTF-16). In SQLite, all text is Unicode, so it’s not relevant. In any case, SQLite is loosely typed so it wouldn’t make a difference anyways. See http://www.sqlite.org/datatype3.html:)
I found out, that it is possible. Use: sqlite3.exe MainDB.db ATTACH DATABASE ‘SomeTableFile.db’ AS stf; Access the table from the other database file: SELECT * FROM stf.SomeTable; You can even join over several files: SELECT * FROM MainTable mt JOIN stf.SomeTable st ON (mt.id = st.mt_id); https://www.sqlite.org/lang_attach.html tameera said there is a limit of 62 … Read more
You can calculate the variance in SQL: create table t (row int); insert into t values (1),(2),(3); SELECT AVG((t.row – sub.a) * (t.row – sub.a)) as var from t, (SELECT AVG(row) AS a FROM t) AS sub; 0.666666666666667 However, you still have to calculate the square root to get the standard deviation.
SELECT * FROM users WHERE column LIKE ‘%mystring%’ will do it. LIKE means we’re not doing an exact match (column = value), but doing some more fuzzy matching. “%” is a wildcard character – it matches 0 or more characters, so this is saying “all rows where the column has 0 or more chars followed … Read more
It seems that all (or many) of the PRAGMA commands can be programatically selected with a little trick; Usually the are called like: PRAGMA table_info(‘my_table’); PRAGMA foreign_key_list(‘my_table’); But this can also be done: SELECT * FROM pragma_table_info(‘my_table’); SELECT * FROM pragma_foreign_key_list(‘my_table’); And the schema can also be (more or less) obtained: .schema pragma_table_info /* pragma_table_info(cid,name,type,”notnull”,dflt_value,pk) … Read more
The documentation says: The database is not actually created or opened until one of getWritableDatabase() or getReadableDatabase() is called.
To allow the VACUUM command to run, change the directory for temporary files to one that has enough free space. SQLite’s documentation says the temporary directory is (in order): whatever is set with the PRAGMA temp_store_directory command; or whatever is set with the SQLITE_TMPDIR environment variable; or whatever is set with the TMPDIR environment variable; … Read more
Update: As of version 3.31.0 (released on 2020-01-22), SQLite supports computed columns so the answer below applies to versions prior to 3.31.0 SQLite doesn’t supported computed columns. However your problem can be solved with a relatively simple SQL Query, you can then create a view to make it appear like a table with the extra … Read more
Just set LIMIT to -1. For example: SELECT * FROM table LIMIT -1 OFFSET 10