行转列一张表 查询结果为 --行转列 select years,(select amount from Tb_Amount as A where month=1 and A.years=Tb_Amount.years)as m1, (select amount from Tb_Amount as A where month=2 and A.years=Tb_Amount.years)as m2, (select amount from Tb_Amount as A where month=3 a
1. MYSQL数据库 1) 创建索引 CREATE INDEX index_name ON table_name(column_list) CREATE UNIQUE INDEX index_name ON table_name(column_list) 修改表的方式添加索引 ALTER TABLE table_name ADD INDEX index_name(column_list) ALTER TABLE table_name ADD UNIQUE (column_list
oracle|索引 create or replace procedure proc_XXX( p_iBillMonth in number, p_tab in number, p_nStatus out number, p_szErrorMsg out varchar2) is type t_cur is ref cursor; v_ser