Roy E Huaman

Roy E Huaman

1601263955

ts-sql: A SQL 'Database' Implemented Purely in TypeScript Type Annotations

This is a SQL database implemented purely in TypeScript type annotations.

This means that it operates solely on types - you define a “database” (just a type annotation) and then query it using some more type annotations.

It supports a subset of SQL, including SELECT (with conditions and joins), INSERT, UPDATE and DELETE statements.

See the live demo

You can install ts-sql in your own project with npm install @codemix/ts-sql or yarn install @codemix/ts-sql (TypeScript 4.1 is required).

An example query looks like this:

import { Query } from "@codemix/ts-sql";

const db = {
  things: [
    { id: 1, name: "a", active: true },
    { id: 2, name: "b", active: false },
    { id: 3, name: "c", active: true },
  ],
} as const;

type ActiveThings = Query<
  "SELECT id, name AS nom FROM things WHERE active = true",
  typeof db
>;

// ActiveThings is now equal to the following type:
type Expected = [{ id: 1; nom: "a" }, { id: 3; nom: "c" }];

See the full demo on the TypeScript playground!

#sql #typescript #database #t-sql

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Buddha Community

ts-sql: A SQL 'Database' Implemented Purely in TypeScript Type Annotations
Cayla  Erdman

Cayla Erdman

1594369800

Introduction to Structured Query Language SQL pdf

SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.

Models for SQL exist. In any case, the SQL that can be utilized on every last one of the major RDBMS today is in various flavors. This is because of two reasons:

1. The SQL order standard is genuinely intricate, and it isn’t handy to actualize the whole standard.

2. Every database seller needs an approach to separate its item from others.

Right now, contrasts are noted where fitting.

#programming books #beginning sql pdf #commands sql #download free sql full book pdf #introduction to sql pdf #introduction to sql ppt #introduction to sql #practical sql pdf #sql commands pdf with examples free download #sql commands #sql free bool download #sql guide #sql language #sql pdf #sql ppt #sql programming language #sql tutorial for beginners #sql tutorial pdf #sql #structured query language pdf #structured query language ppt #structured query language

Roy E Huaman

Roy E Huaman

1601263955

ts-sql: A SQL 'Database' Implemented Purely in TypeScript Type Annotations

This is a SQL database implemented purely in TypeScript type annotations.

This means that it operates solely on types - you define a “database” (just a type annotation) and then query it using some more type annotations.

It supports a subset of SQL, including SELECT (with conditions and joins), INSERT, UPDATE and DELETE statements.

See the live demo

You can install ts-sql in your own project with npm install @codemix/ts-sql or yarn install @codemix/ts-sql (TypeScript 4.1 is required).

An example query looks like this:

import { Query } from "@codemix/ts-sql";

const db = {
  things: [
    { id: 1, name: "a", active: true },
    { id: 2, name: "b", active: false },
    { id: 3, name: "c", active: true },
  ],
} as const;

type ActiveThings = Query<
  "SELECT id, name AS nom FROM things WHERE active = true",
  typeof db
>;

// ActiveThings is now equal to the following type:
type Expected = [{ id: 1; nom: "a" }, { id: 3; nom: "c" }];

See the full demo on the TypeScript playground!

#sql #typescript #database #t-sql

Ruth  Nabimanya

Ruth Nabimanya

1621850444

List of Available Database for Current User In SQL Server

Introduction

When working in the SQL Server, we may have to check some other databases other than the current one which we are working. In that scenario we may not be sure that does we have access to those Databases?. In this article we discuss the list of databases that are available for the current logged user in SQL Server

Get the list of database
Conclusion

#sql server #available databases for current user #check database has access #list of available database #sql #sql query #sql server database #sql tips #sql tips and tricks #tips

Ruth  Nabimanya

Ruth Nabimanya

1620633584

System Databases in SQL Server

Introduction

In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.

System Database

Fig. 1 System Databases

There are five system databases, these databases are created while installing SQL Server.

  • Master
  • Model
  • MSDB
  • Tempdb
  • Resource
Master
  • This database contains all the System level Information in SQL Server. The Information in form of Meta data.
  • Because of this master database, we are able to access the SQL Server (On premise SQL Server)
Model
  • This database is used as a template for new databases.
  • Whenever a new database is created, initially a copy of model database is what created as new database.
MSDB
  • This database is where a service called SQL Server Agent stores its data.
  • SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.
TempDB
  • The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
  • User can create their own version of temporary tables and those are stored in Tempdb.
  • But this database is destroyed and recreated every time when we restart the instance of SQL Server.
Resource
  • The resource database is a hidden, read only database that holds the definitions of all system objects.
  • When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.

#sql server #master system database #model system database #msdb system database #sql server system databases #ssms #system database #system databases in sql server #tempdb system database

Ruth  Nabimanya

Ruth Nabimanya

1620648300

What is SQL? And Where is it Used?

Define: SQL [pron. “sequel”] – stands for Structured Query Language (SQL), used by databases to model and manage tabular/relational datasets; a set of standardized Data Definition Language (DDL) functions to create tables, views, and define relational schema models, and Data Manipulation Language (DML) to query, insert, and modify data in the tables.

*Read-only select queries are technically part of its Data Query Language (DQL) group. Still, operationally, many refer to it as DML because it can do more than read-only queries.

Super Brief History of SQL

Who Uses SQL?

What Can a SQL Database Do?

What is a SQL Query?

Different SQL Database Platforms

SQL for JSON

Application Developers

SQL for Big Data

Further Reading

#sql #database #relational-database #nosql #json #sql-database #database-administration #databases-best-practices