//ELEMENT DOM选择//on are tag names. //All the divs on the page: $$('div'); //All the divs and paragraphs //note: this returns an array with all the divs first, //then all the paragraphs: $$('div', 'p'); //When you include Selectors.js, you can //pass
PostgreSQL获取数据库中所有table名: SELECT tablename FROM pg_tables WHERE tablename NOT LIKE 'pg%' AND tablename NOT LIKE 'sql_%' ORDER BY tablename; PostgreSQL获取数据库中所有table名及table的注解信息: SELECT tablename, obj_description(relfilenode, 'pg_class') FROM pg_tables
excel表如何实现多if选择结构多分支判断 一.总结 一句话总结:把多if分支转换成单if分支相加. 也可以if分支,也可以lookup函数. 1.CHOICE: +2 if band A; +1 if band B or DSE ICT >= 4; 0 otherwise (i.e. band C)在excel中如何实现(N列是band.p列是DSE_ICT)? 把多if分支转换成单if分支相加. =IF(N3="A",2,0) + IF(AND(N3="B&quo
declare v_count number; begin ) into v_count from all_tab_columns a where a.TABLE_NAME = 'XXX1' and a.COLUMN_NAME = 'TEST1'; ) THEN EXECUTE immediate 'ALTER TABLE XXX1 DROP COLUMN TEST1'; END IF; end; 字段名是保存在sys.col$中,但是一般开发人员没权限,但是会有一个视图,一般情况下视图名为al
一.比如说要判断表A中的字段C是否存在两个方法: (1) 直接查表——有点笨,有点常规 IF EXISTS ( SELECT 1 FROM SYSOBJECTS T1 INNER JOIN SYSCOLUMNS T2 ON T1.ID=T2.ID WHERE T1.NAME='A' AND T2.NAME='C' ) PRINT '存在' ELSE PRINT '不存在' (2) 直接判断列长度的函数——短小精悍,可谓精典 IF COL_LENGTH('A', 'C') IS NOT NULL
