文章目录 1、常见访问路径1.1、TABLE ACCESS FULL1.2、TABLE ACCESS BY USER ROWID1.3、TABLE ACCESS BY ROWID RANGE1.4、TABLE ACCESS BY INDEX ROWID1.5、INDEX UNIQUE SCAN1.6、INDEX RANGE SCAN1.7、INDEX SKIP SCAN1.8、INDEX FULL SCAN1.9、INDEX FAST FULL SCAN1.10、I…
解上三角(回代) a i i ≠ 0 a_{ii\neq0} aii0 , i 1 , 2 , … , n i1,2,\ldots,n i1,2,…,n a 11 x 1 a 12 x 2 ⋯ a 1 n x n b 1 a 22 x 2 ⋯ a 2 n x n b 2 ⋯ a n n x n b n \begin{aligned} a_{11}x_1a_{12}x_2\cdotsa_{1n}x_n&b_1 \\ a_{22}x_2\cdotsa_…