Join Bill Weinman for an in-depth discussion in this video Understanding SQL expressions, part of PostgreSQL 9 with PHP Essential Training.
In Postgres as in standard SQL an expression may be used anywhere a value can be used.…For example, this SELECT statement will return 1 value, 25, the result of the…expression 5 times 5, and the INSERT statement will insert a row with the number…4, a NULL value and the string your name in all Lowercase letters.…Expressions use operators to operate on values or the results of other expressions.…The Standard operators include the string concatenation operator, arithmetic…operators, comparison operators, and boolean operators.…
Other special operators include IS and IS NOT for comparisons, query result…matching operator is LIKE, ILIKE, and SIMILAR TO for regular expressions,…BETWEEN for paired comparisons and IN and NOT IN for testing inclusion in a…list or query result.…CASE is the conditional operator like IF /THEN/ELSE in other languages and it's…also used like a ternary conditional operator in C like languages.…
- Installing PostgreSQL
- Understanding database architecture
- Inserting, updating, and deleting data in a table
- Creating a database library
- Indexing ID fields
- Storing numbers, text, and Boolean values
- Reading data
- Using casts to force type
- Using mathematical functions
- Concatenating strings
- Working with date and time functions and operators
- Defining CRUD
- Using PHP to insert, read, update, and delete rows in a database
Skill Level Beginner
1. Quick Start
2. Creating a Database
3. Data Types
4. Storing and Reading Data
5. SQL Expressions
6. Mathematical Functions and Operators
Using math functions3m 2s
7. String Functions and Operators
8. Date and Time Functions and Operators
9. PHP Interfaces
10. Web Applications
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