sql - how to insert multiple row in single query in PostgreSQL -

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i have variable holds multiple data, , want insert multiple data postgresql database using single query.

the field on table this: stud_tbl(id,fname,lname)

and variable holds multiple data;

variable = (123,ron,lum),(234,nald,bay),(345,rol,lumz)

my query:

str = "insert stud_tbl values ('" & variable & "')"

when execute query error , can't identify error.

to expand on @patrick's comment:

variable = "(123,'ron','lum'),(234,'nald','bay'),(345,'rol','lumz')"

the query:

str = "insert stud_tbl values " & variable

though usual warnings (how can prevent sql injection in php?) not being best practice apply.


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