Redis

SELECT Statements

The Provider for Redis is SQL-92 compliant. Below are some example SELECT statements.

1. Return all columns:
2. Rename a column:
3. Search data:
4. Return the number of items in a group:
5. Return the number of unique items in a group:
6. Summarize data:
7. Retrieve data from multiple tables.

   See JOIN Queries below for details.

8. Sort a result set in ascending order:
9. Restrict a result set to the specified number of rows:
10. Parameterize a query to pass in inputs at execution time. This enables you to create prepared statements and mitigate SQL injection attacks.

Aggregate Functions

The provider supports SQL-92 summary functions.

COUNT

Returns the number of rows matching the query criteria.

COUNT_DISTINCT

Returns the number of distinct, non-null field values matching the query criteria.

AVG

Returns the average of the column values.

MIN

Returns the minimum column value.

MAX

Returns the maximum column value.

SUM

Returns the total sum of the column values.

JOIN Queries

The Provider for Redis supports joins of multiple tables.

Joining Multiple Tables

You can join multiple tables just like you would in a relational database. Set SupportEnhancedSQL to True to execute these types of joins. The following examples use two tables: Restaurants and Zips.

The query below returns the Restaurant records that exist, if any, for each ZIP code:

The query below returns records from both tables that match the join condition:

Date Literal Functions

The following date literal functions can be used to filter date fields using relative intervals. Note that while the <, >, and = operators are supported for these functions, <= and >= are not.

L_TODAY()

The current day.

L_YESTERDAY()

The previous day.

L_TOMORROW()

The following day.

L_LAST_WEEK()

Every day in the preceding week.

L_THIS_WEEK()

Every day in the current week.

L_NEXT_WEEK()

Every day in the following week.

Also available:

• L_LAST/L_THIS/L_NEXT MONTH

• L_LAST/L_THIS/L_NEXT QUARTER

• L_LAST/L_THIS/L_NEXT YEAR

L_LAST_N_DAYS(n)

The previous n days, excluding the current day.

L_NEXT_N_DAYS(n)

The following n days, including the current day.

Also available:

• L_LAST/L_NEXT_90_DAYS

L_LAST_N_WEEKS(n)

Every day in every week, starting n weeks before current week, and ending in the previous week.

L_NEXT_N_WEEKS(n)

Every day in every week, starting the following week, and ending n weeks in the future.

Also available:

• L_LAST/L_NEXT_N_MONTHS(n)

• L_LAST/L_NEXT_N_QUARTERS(n)

• L_LAST/L_NEXT_N_YEARS(n)