An expression is a combination of constants, alias calls, operators and functions that produces one or more values.
Purpose |
Example |
|---|---|
| Use decimal constant | -10.25，1，1691636269 |
| Use textual constant | "graph"，'uql'，' both ' and " '，"2020-01-01 0:0:0" |
| Build list with constant | [1, 2, 3]，["graph", "database"]，[ ] |
| Call an alias | nodes，edges，paths，mylist，groupName，count，`ABC-123` |
| Call a property | nodes.age，edges.`version-old`，this.age，age |
| Call the values of coordinates of a point data | location.x，location.y |
| Call the schema | edges.@，this.@ |
| Call the element(s) of a list | mylist[5]，mylist[3:6]，mylist[2:]，mylist[:4] |
| Build list with alias | [nodes.level, -1, "NaN"]，[groupName, count] |
| Decuplication | DISTINCT nodes.name，DISTINCT nodes.name, nodes.age |
| Numeric operation | 1 + 3 * 2，year("2022-04-12") % 4 |
| Conditional operation | 3 > 1，nodes.age == 20，@default，groupName IN ["graph", "database"] |
| Logical operation | @student && age > 10 |
| General function operation | now()，toString(nodes.age)，length(paths) |
| Aggregation function operation | count(nodes)，collect(nodes.age) |
| CASE function operation | CASE WHEN score >= 80 THEN "pass" ELSE "fail" END |
| Judgement on null | nodes.age IS NULL，edges.time IS NOT NULL |