IS NULL IS NULL运算符如果其操作数为NULL返回值为TRUE,如果不为NULL则返回FALSE。 涉及NULL值的比较总是产生NULL。 如果x ='m',则is null'返回false 。 LIKE运算符 DECLARE PROCEDURE compare (value varchar2, pattern varchar2 ) is BEGIN IF value LIKE pattern THEN dbms_output.put_line ('True'); ...
Between value1 and value2 ;value1的值比value2值小,表示值在value1和value2之间 is null:表示这个值是空时条件成立 --select * from emp where comm is null; is not null:表示值不为空时条件成立 --查询员工的年薪 Select ‘年薪’, sal*12 from emp; 4.排序分组 (1)排序 select 列名,列名,..,...
DECLARE v_count binary_integer := 1 /* LOOP循环 */ BEGIN LOOP insert into tmp_table(num_col) value (v_count); v_count := v_count + 1; EXIT WHEN v_count > 50; END LOOP; END; /* FOR循环 */ BEGIN FOR v_count in 1..50 LOOP insert into tmp_table(num_col) value (v_count...
maxvalue60 minvalue50 cycle cache3; 2) sqlcreatesequencenew_s; sqlinsertintonew(new_id,last_name,first_name) values(new_s.nextval,daur,permit); 三、createview语句 语句:CREATE[ORREPLACE][FORCEINOFORCE]VIEW[schema.]view_name [(alias[,alias]...)] ASsubquery [WITHCHECKOPTION[CONSTRAINTconstra...
type c_stu is ref cursor; --定义函数 function numAdd(num1 number,num2 number)return number; --定义过程 procedure GetStuList(cid in varchar2,c_st out c_stu); end; --2、实现包体,名称一致。 create or replace package body p_stu
update tableName set column=value [,column=value2,...] [where condition] 3.删除数据 使用DELETE语句从表中删除数据。 如果省略HERE子句,则表中的全部数据将被删除; 语法: delete from tableName [where conditin] 例子:delete from test1 where id=2; ...
base_json_pre_list = [] # 保存遍历多余字段的前缀 extra_pre_list = [] def do_check...('['+"\""+key_c+"\""+']') # TODO: 更复杂的嵌套情况没有仔细想,但是应该不影响 if key_c in jsonBase:...() # 检查额外的字段 def do_check_extra(json_object): if isinstance(json_object,...
in between value1 and value2 like % _ in null not no in,is not null 谓词in和not in 有哪些职员和分析员 select ename,job from emp where job in ('clerk','analyst'); select ename,job from emp where job not in ('clerk','analyst'); ...
The PL/SQL tables used as parameters in the mod_plsql environment must have a base type ofVARCHAR2. Oracle can convertVARCHAR2to other data types such asNUMBER,DATE, orLONG. The maximum length of aVARCHAR2variable is 32K. If you cannot guarantee that at least one value will be submitted...
技术实现:if对年份进行判断,loop对每年入职的员工进行迭代访问 declare cursor c_emplist is select to_char(hiredate,'yyyy')from emp; --定义三个年份变量 v_count81 number:=0; v_count87 number:=0; v_count20 number:=0; v_hiredate varchar2(4); begin open c_emplist; loop --遍历数据 fetch...