Export schema without data
You can do with the –no-data option with mysqldump command mysqldump -h yourhostnameorIP -u root -p –no-data dbname > schema.sql
database-schema
Database table design for scheduling tasks
This is the table structure i came up with; Schedule – ScheduleName – ScheduleTypeId (Daily, Weekly, Monthly, Yearly, Specific) – StartDate – IntervalInDays – Frequency – FrequencyCounter ScheduleDaily – ScheduleDailyId – ScheduleId – TimeOfDay – StartDate – EndDate ScheduleMonthly – ScheduleMonthlyId – ScheduleId – DayOfMonth – StartDate – EndDate ScheduleSpecific – ScheduleSpecificId – ScheduleId – … Read more
Designing a SQL schema for a combination of many-to-many relationship (variations of products)
Applying normalization to your problem, the solution is as given. Run and see it on SQL Fiddle. CREATE TABLE products ( product_id int AUTO_INCREMENT PRIMARY KEY, name varchar(20), description varchar(30) ); INSERT INTO products (name, description) VALUES (‘Rug’, ‘A cool rug’ ), (‘Cup’, ‘A coffee cup’); — ======================================== CREATE TABLE variants ( variant_id int AUTO_INCREMENT … Read more
Rails 3. Creating a production database
You can set the rails env off of the environment variable RAILS_ENV RAILS_ENV=production bundle exec rake db:create db:schema:load should work
InfluxDB : single or multiple measurement
Bit of an old question but this is probably relevant to anyone working on TSDBs. When I first started, my appoach used to be that every data point went into a single field measurement. The assumption was that I’d combine the data I needed in a SQL statement at a later date. However, as anyone … Read more
Migrating ManyToManyField to null true, blank true, isn’t recognized
That behavior is correct: null doesn’t mean anything at the database level when used with a ManyToManyField. The declaration of a ManyToManyField causes the creation of an intermediate table to hold the relationship, and although Django will create a standard attribute on your model instance for your convenience, there is no actual column representing it … Read more
mysqldump – exclude some table data
This will produce export.sql with structure from all tables and data from all tables excluding table_name mysqldump –ignore-table=db_name.table_name db_name > export.sql mysqldump –no-data db_name table_name >> export.sql
PostgreSQL: Export the schema of a database
You should take a look at pg_dump: pg_dump –schema-only databasename Will dump only the schema to stdout as .sql. For windows, you’ll probably want to call pg_dump.exe. I don’t have access to a Windows machine but I’m pretty sure from memory that’s the command. See if the help works for you too.
Why use a 1-to-1 relationship in database design?
From the logical standpoint, a 1:1 relationship should always be merged into a single table. On the other hand, there may be physical considerations for such “vertical partitioning” or “row splitting”, especially if you know you’ll access some columns more frequently or in different pattern than the others, for example: You might want to cluster … Read more
Setting schema name for DbContext
You can configure the default schema in OnModelCreating method of your custom inherited DbContext class like – public class MyContext: DbContext { public MyContext(): base(“MyContext”) { } public DbSet<Student> Students { get; set; } protected override void OnModelCreating(DbModelBuilder modelBuilder) { //Configure default schema modelBuilder.HasDefaultSchema(“Ordering”); } } Starting with EF6 you can use the HasDefaultSchema method … Read more