DELETE TAG¶
DELETE TAG deletes a tag with the given name on a specified vertex.
Prerequisites¶
Running the DELETE TAG statement requires some privileges for the graph space. Otherwise, NebulaGraph throws an error.
Syntax¶
ngql
DELETE TAG <tag_name_list> FROM <VID>;
tag_name_list: Specifies the name of the tag. Multiple tags are separated with commas (,).*means all tags.
VID: Specifies the VID of the tag to delete.
Example¶
ngql
nebula> CREATE TAG IF NOT EXISTS test1(p1 string, p2 int);
nebula> CREATE TAG IF NOT EXISTS test2(p3 string, p4 int);
nebula> INSERT VERTEX test1(p1, p2),test2(p3, p4) VALUES "test":("123", 1, "456", 2);
nebula> FETCH PROP ON * "test" YIELD vertex AS v;
+------------------------------------------------------------+
| v |
+------------------------------------------------------------+
| ("test" :test1{p1: "123", p2: 1} :test2{p3: "456", p4: 2}) |
+------------------------------------------------------------+
nebula> DELETE TAG test1 FROM "test";
nebula> FETCH PROP ON * "test" YIELD vertex AS v;
+-----------------------------------+
| v |
+-----------------------------------+
| ("test" :test2{p3: "456", p4: 2}) |
+-----------------------------------+
nebula> DELETE TAG * FROM "test";
nebula> FETCH PROP ON * "test" YIELD vertex AS v;
+---+
| v |
+---+
+---+
Compatibility
- In openCypher, you can use the statement
REMOVE v:LABELto delete the tagLABELof the vertexv. DELETE TAGandDROP TAGhave the same semantics but different syntax. In nGQL, useDELETE TAG.