乘法表
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结果:
--------------------------------------------------------------------------------1*1=12*1=2 2*2=43*1=3 3*2=6 3*3=94*1=4 4*2=8 4*3=12 4*4=165*1=5 5*2=10 5*3=15 5*4=20 5*5=256*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=367*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=498*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=649*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81
1 、case when or decode(多列转一行)
with t1 as (select level x from dual connect by level <= 9),t2 as (select a.x x, b.x y from t1 a, t1 b where a.x >= b.x)select max(decode(y, 1, x || '*' || y || '=' || x * y)) col1, max(decode(y, 2, x || '*' || y || '=' || x * y)) col2, max(decode(y, 3, x || '*' || y || '=' || x * y)) col3, max(decode(y, 4, x || '*' || y || '=' || x * y)) col4, max(decode(y, 5, x || '*' || y || '=' || x * y)) col5, max(decode(y, 6, x || '*' || y || '=' || x * y)) col6, max(decode(y, 7, x || '*' || y || '=' || x * y)) col7, max(decode(y, 8, x || '*' || y || '=' || x * y)) col8, max(decode(y, 9, x || '*' || y || '=' || x * y)) col9 from t2 group by x order by x
2、listagg 函数(多列转一行)
with t1 as (select level x from dual connect by level <= 9),t2 as (select a.x x, b.x y from t1 a, t1 b where a.x >= b.x)select listagg(x || '*' || y || '='|| x * y, ' ') within group(order by x) from t2 group by x;
3、wm_concat()函数(多列转一行)
with t1 as (select level x from dual connect by level <= 9),t2 as (select a.x x, b.x y from t1 a, t1 b where a.x >= b.x) select to_char(wm_concat(x || '*' || y || '=' || x * y || ' ') keep(dense_rank first order by x))--keep取分组第一条数据,支持排序 from t2 group by x
4、sys_connect _by_path()函数
with t1 as (select level x from dual connect by level <= 9),t2 as (select a.x x, b.x y from t1 a, t1 b where a.x >= b.x)select substr(max(mup),2) from (select sys_connect_by_path(mut,',')mup from (select mut, rn, lag(rn) over(partition by substr(mut, 1, 1) order by rn) seq from (select x || '*' || y || '=' || x * y mut, row_number() over(order by x, y) rn from t2)) start with seq is nullconnect by prior rn = seq) group by substr(mup,2,1) order by substr(mup,2,1);
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