selectdistinct字段名 form 表名; 9.连接字段 selectconcat(字段,字段)as别名; 10判断空值 ifnull(字段,0) --对列中有空值的使用 二、条件查询 1.1语法:select 查询列表 from 表名 where 筛选条件; 1.2分类:条件表达式筛选 、逻辑表达式筛选、模糊查询(like, between and, in, is null) 例如: like:select ...
(查看2列的值) selectname , populationfromcity;selectname , population form world.city;#推荐使用这种方法 1.3.3 单表查询练习环境:world数据库下的表介绍 world.sql下载链接:https://pan.baidu.com/s/1eR5Yo0-IcF8QspcRxOPHbA 提取码:paik 查看库中所有表 showtablesfromworld; city:(城市)desccity; id...
such as creating tables, inserting data, querying information, and controlling access and security. SQL commands can be categorized into different types, each serving a specific purpose in the database management process.
import openai from "../../openai.app.mjs"; import common from "../common/common-assistants.mjs"; import FormData from "form-data"; import fs from "fs"; export default { ...common, key: "openai-analyze-image-content", name: "Analyze Image Content", description: ...
execute exec_sql with query=’execute my_sp_test ”123”,”prasad” ‘; 3. Running DQL in batch mode a. Create a dql file b. Run the following from command prompt $idql docbasename -Uusername -Ppassword -Rtest.dql Example command ...