please answer the above two questions. Thanks

1. Relation R has schema: CREATE TABLE RC a INT PRIMARY KEY, bINT DEFAULT 0, C INT NOT NULL Ris currently empty. Develop a test that determines whether an insertion into R is currently legal. Then apply your test to determine which of the following INSERT statements is allowable. a) INSERT INTOR VALUES(7.8.NOT NULL); b) INSERT INTO R(a,b) VALUES(1.2); O c) INSERT INTO R(6.a) VALUES(5,6); d) INSERT INTO R(c.a) VALUES(6.7); 2. Here are declarations of two relations R and S: CREATE TABLE SC C INT PRIMARY KEY, d INT ); CREATE TABLE RC a INT PRIMARY KEY, b INT REFERENCES S(c) Rab) currently contains the four tuples (0.4), (1,5), (2.4), and (3.5). S(cd) currently contains the four tuples (2,10), (3,11). (4,12), and (5.13). As a result, certain insertions and deletions on R and S are illegal. You should develop simple tests for illegal operations of these four kinds. Then, show your understanding by indicating which of the following modifications will not violate any constraint. a) Inserting (5,6) into R Ob) Deleting (4,12) from S. c) Inserting (1.2) into R d) Inserting (6.4) into R