Gravit Designer Free full-featured vector graphic design app that works on ALL platforms Blender Open source, free animation, 3D modeling, etc. Raw Therapee Cross-platform raw image processing program Be Funky Online design program Krita Sketching and painting program designed for digital artists Penci...
form tableName1 left/right join tableName2 on(table1.column = tableName2.column ); 内连接:inner join,取交集,以全连接作为基准,筛选条件符合的数据; 全连接:full join,左连接+右连接; 笛卡尔集:拿a表的每一条去拼接b表的每一条,a*b; selectcolumnfromtableName1,tableName2;s...