(select value from demo.data where id=q.id and key='timestampstart')::timestamp - (select value from demo.data where id=q.id and key='timestampend')::timestampįrom (select distinct id from demo.data) qĮrror is the same: ERROR: syntax error at or near "::" (select value from demo.data where id=q.id and key = 'timestampend')::timestamp as TStart,Įxtract(days from duration1)::int * 24 + extract(hours from duration1)::int, - calculated hours (days * 24 + hours)Įxtract(mins from duration1)::int, - minutesįloor(extract(secs from duration1))::int - seconds, without miliseconds, thus FLOOR() (select value from demo.data where id=q.id and key = 'timestampstart')::timestamp as TEnd, I'm testing this query: select id as ticketid, The problem is that the first timestamp is and the second is so we have 1 day and some hours of difference. Look at this example, if you want easier: select timestamp_end::timestamp - timestamp_start as duration
(select value from demo.data where id=q.id and key='timestampstart')::timestamp) as durata Just follow the thread) (select value from demo.data where id=q.id and key='timestampend')::timestamp Here the code: (isn't necessary you understand tables below. User.I'm creating a select that calculate the difference between two timestamps.User.sync() - This creates the table if it doesn't exist (and does nothing if it already exists).Note that this changes only the table in the database, not the model in the JavaScript side. With this call, Sequelize will automatically perform an SQL query to the database. A model can be synchronized with the database by calling model.sync(options), an asynchronous function (that returns a Promise). This is where model synchronization comes in. However, what if the table actually doesn't even exist in the database? What if it exists, but it has different columns, less columns, or any other difference? When you define a model, you're telling Sequelize a few things about its table in the database. After being defined, we can access our model with. We want our model to be called User, and the table it represents is called Users in the database.īoth ways to define this model are shown below. To learn with an example, we will consider that we want to create a model to represent users, which have a firstName and a lastName. Extending Model and calling init(attributes, options)Īfter a model is defined, it is available within sequelize.models by its model name.Calling fine(modelName, attributes, options).Models can be defined in two equivalent ways in Sequelize: Usually, models have singular names (such as User) while tables have pluralized names (such as Users), although this is fully configurable. This name does not have to be the same name of the table it represents in the database. The model tells Sequelize several things about the entity it represents, such as the name of the table in the database and which columns it has (and their data types).Ī model in Sequelize has a name. In Sequelize, it is a class that extends Model. A model is an abstraction that represents a table in your database.
POSTGRESQL TIMESTAMP DIFFERENCE HOW TO
In this tutorial you will learn what models are in Sequelize and how to use them.
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