Go into Tools -> Options -> Designers-> Uncheck “Prevent saving changes that require table re-creation”. Voila. That happens because sometimes it is necessary to drop and recreate a table in order to change something. This can take a while, since all data must be copied to a temp table and then re-inserted in the new … Read more
From http://www.sqlite.org/lang_createtable.html: CREATE TABLE IF NOT EXISTS some_table (id INTEGER PRIMARY KEY AUTOINCREMENT, …);
SQL Server Management Studio’s “Import Data” task (right-click on the DB name, then tasks) will do most of this for you. Run it from the database you want to copy the data into. If the tables don’t exist it will create them for you, but you’ll probably have to recreate any indexes and such. If … Read more
PRAGMA table_info(table_name); will get you a list of all the column names.
There’s three ways to get this sort of count, each with their own tradeoffs. If you want a true count, you have to execute the SELECT statement like the one you used against each table. This is because PostgreSQL keeps row visibility information in the row itself, not anywhere else, so any accurate count can … Read more
To add a unique constraint, you need to use two components: ALTER TABLE – to change the table schema and, ADD UNIQUE – to add the unique constraint. You then can define your new unique key with the format ‘name'(‘column1’, ‘column2’…) So for your particular issue, you could use this command: ALTER TABLE `votes` ADD … Read more
SQL Server 2000, 2005, 2008, 2012, 2014, 2016, 2017 or 2019: SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE=’BASE TABLE’ To show only tables from a particular database SELECT TABLE_NAME FROM [<DATABASE_NAME>].INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = ‘BASE TABLE’ Or, SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = ‘BASE TABLE’ AND TABLE_CATALOG=’dbName’ –(for MySql, use: TABLE_SCHEMA=’dbName’ ) PS: For SQL … Read more