SQL Expressions
SQL expressions are special expressions in the expression language, which are converted into SQL and evaluated in an external system that supports SQL (e.g., Snowflake, SQL Server, Databricks, Redshift). Only a subset of expression language functionalities are supported by SQL expressions (which are explained in this page).
- Arithmetics operators: Addition (+), Subtraction (-), Multiplication (*), Division (/), Remainder (%)
- Comparison operators: ==, <, <=, >, >=, !=.
- Logical operators: && (AND), || (OR), ! (NOT) are used to combine expressions that return boolean values.
- Data types: strings ("this is a string"), integers (123), decimal numbers (123.45), booleans (true, false)
- null value (null)
| Function | Parameters | Description |
|---|---|---|
| CaseWhen |
Goes through conditions and returns a value when the first condition is met, similar to an if-then-else. Once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the else-expression. Consists of any number of pairs of condition and value expressions followed by an optional else expression. CaseWhen(Column("a") == null, 1, Column("a") < 1.0, 2, 3)
Returns 1 if the value of column "a" is null.
Returns 2 if the value of column "a" is less than 1.0.
Returns 3 otherwise.
| |
| Ceiling | number |
Returns given value rounded to the nearest equal or larger integer. The data type should be one of the numeric data types. If the value is null, then the result is also null. |
| Coalesce |
Returns the first non-null parameter it is given. There can be any number of parameters. If all parameters are null, returns null. | |
| Column | Return the value of given column. | |
| Concat |
Return the concatenated string value of given values. | |
| Floor |
Returns given value rounded to the nearest equal or smaller integer. The data type should be one of the numeric data types. If the value is null, then the result is also null. | |
| Variable |
Returns the value of given variable. Supports number, string and boolean values. Examples: let x = "124256122";
CreateRedshiftConnection().Table("eventlog_o2c_events").Where(#sql{Column("CaseId")==Variable("x")}).Collect()
Returns cases having id equal to "124256122".
| |
| DateDiff |
Calculates the count of the specified datepart boundaries crossed between the specified dates. Parameters:
| |
| Day | Returns the days part of given timestamp. | |
| Hour | Returns the hours part of given timestamp. | |
| Millisecond | Returns the milliseconds part of given timestamp. | |
| Minute | Returns the minutes part of given timestamp. | |
| Month | Returns the months part of given timestamp. | |
| Second | Returns the seconds part of given timestamp. | |
| Year | Returns the years part of given timestamp. |