diff --git a/2-Working-With-Data/05-relational-databases/README.md b/2-Working-With-Data/05-relational-databases/README.md index b00aae5d..10c31ea8 100644 --- a/2-Working-With-Data/05-relational-databases/README.md +++ b/2-Working-With-Data/05-relational-databases/README.md @@ -88,7 +88,8 @@ With our cities table created, let's store the rainfall. Rather than duplicating Notice the **city_id** column inside the newly created **rainfall** table. This column contains values which reference the IDs in the **cities** table. In technical relational data terms, this is called a **foreign key**; it's a primary key from another table. You can just think of it as a reference or a pointer. **city_id** 1 references Tokyo. -> [!NOTE] Foreign key is frequently abbreviated as FK +> [!NOTE] +> Foreign key is frequently abbreviated as FK ## Retrieving the data @@ -108,7 +109,8 @@ FROM cities; `SELECT` is where you list the columns, and `FROM` is where you list the tables. -> [NOTE] SQL syntax is case-insensitive, meaning `select` and `SELECT` mean the same thing. However, depending on the type of database you are using the columns and tables might be case sensitive. As a result, it's a best practice to always treat everything in programming like it's case sensitive. When writing SQL queries common convention is to put the keywords in all upper-case letters. +> [!NOTE] +> SQL syntax is case-insensitive, meaning `select` and `SELECT` mean the same thing. However, depending on the type of database you are using the columns and tables might be case sensitive. As a result, it's a best practice to always treat everything in programming like it's case sensitive. When writing SQL queries common convention is to put the keywords in all upper-case letters. The query above will display all cities. Let's imagine we only wanted to display cities in New Zealand. We need some form of a filter. The SQL keyword for this is `WHERE`, or "where something is true".