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24 Cards in this Set
- Front
- Back
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SQL (abbrev) |
Structured query language |
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SQL (Definition) |
Programming language designed to manage data stored in relational databases |
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Relational Database |
Database that organizes information into one or more tables |
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Date format |
YYYY-MM-DD |
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Select * from |
Allows you to view information from a given table |
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Statement |
A string of characters that the database recognizes as a valid command |
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Create table |
Creates new table |
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Insert into |
Adds new row to a table |
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Select |
Queries data from a table |
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Update |
Edits a row in a table |
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Alter table |
Changes existing table |
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Delete from |
Deletes row from a table |
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Where |
Let's you filter results of query based on conditions you specify |
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Like and between |
Special operators used with where to filter query on two or more conditions |
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Order by |
Lets you sort the results of a query in ascending or descending order |
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Limit |
Lets you specify the maximum number of rows that the query will return |
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Count |
Takes name of column(s) as an argument and counts the number of rows where the value is not null |
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Group by |
A clause used with aggregate functions to combine data from one or more columns |
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Sum () |
Tales column as argument and returns the sum of all values in that column |
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Max () |
Takes column as argument and returns max value in that column |
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Avg () |
Takes a column as an argument and returns the average value for that column |
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Round |
Takes two arguments, a column name and the number of decimal places to round the values in that column |
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Primary key |
A unique identifier for each row or record in a given table (id) |
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Foreign key |
A column that contains the primary key of another table in the database |
