Introducción a PostgreSQL
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Este curso dura 4 días con 8 horas cada uno (cursos presenciales) o 5 horas cada uno (cursos online).
La única diferencia es que habrá menos ejercicios prácticos en los cursos online. Sin embargo, se los entregaremos y los podrán hacer por su cuenta y pedir ayuda a nuestros consultores o realizar comentarios en caso de ser necesario.
Audiencia
Este workshop está orientado a personas que quieren iniciarse en SQL y PostgreSQL. Aprenderá cómo usar PostgreSQL y como escribir sentencias SQL adecuadamente. Comenzamos con temas básicos como normalización, claves externas y avanzamos paso a paso hacia temas como uniones, subselecciones, análisis y demás. El objetivo es enseñar a los participantes el SQL necesario para trabajar con PostgreSQL mediante ejemplos prácticos y así darles las herramientas para su trabajo diario.
Contenido
Covered topics:
Installing PostgreSQL
- Connection to the database
- Usage of pgAdmin4 and similar tools
Relational data models
- Normalization
- Creating tables and using data types
- Primary Keys and Foreign Keys
- Check constraints
Basic SQL commands
- INSERT: Insert data
- SELECT: Simple queries
- UPDATE: Modify data
- DELETE and SELECT: Delete data
- Filter data
- NULL Handling
- Sort data with ORDER BY
- LIKE queries
- UNION ALL, UNION, EXCEPT
- DISTINCT and DISTINCT ON
- LIMIT and OFFSET
Aggregate functions
- Aggregate data (count, sum, etc.)
- Minimum and maximum values
- Group data (GROUP BY … HAVING …)
- Use ordered sets (WITHIN GROUP …)
Subqueries and CTEs
- Nested queries
- Common Table Expressions (CTEs)
- Use IN and NOT IN
- EXISTS and NOT EXISTS
Joins
- Understand inner joins
- Use outer joins
- Semi joins, anti joins
Date
- Calculating with date and time
- Understanding intervals
- Include range types
Windowing and Analytics
- OVER-clauses
- Partitioning
- Define sliding windows
- Important analytical functions (rank, lag, etc.)
- Time series analysis
Views and materialized views
- Basic views
- Dependency handling
- Using materialized views
Transactions
- BEGIN, ROLLBACK
- Row locking and table locking
- Transaction isolation levels (read committed, etc)
- SELECT … FOR UPDATE
- Deadlocks
Cursor
- Declare cursor
- WITH HOLD cursor
Indexing
- Creating and deleting indexes
- Identify missing indexes
- Avoiding unnecessary indexes
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