问如何在PostgreSQL中编写if内的select语句EN1. 列的别名 as:全称：alias(别名),可以省略 列的别名可以...
for target in 查询语句 loop 主体部分 end loop [label]; 1. 2. 3. 4. target是一个记录变量,必须在declare部分先声明,比如声明用户信息:us_info record,完整案例如下: do $$ declare t_o record; begin for t_o in (select * from t_order) loop raise notice 'ID:%,客户:%',t_o.id,t_o....
问在Postgresql中使用select的If语句EN我很难用select来做if，例如：非常复杂的结果集合，Mapper文件可能长...
postgresql自定义if函数兼容 createorreplacefunctionif(blnboolean,inValue1 anyelement,inValue2 anyelement)returnsanyelementas$$beginif bln=truethenreturninValue1;elsereturninValue2;endif;end; $$languageplpgsql;createorreplacefunctionif(blnboolean,inValue1numeric,inValue2numeric)returnsnumericas$$beginif bl...
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So this is how we can use all the above functions to select if the string contains a substring Match in PostgreSQL. Conclusion We can select if the string contains our specified substring in Postgres by using the five methods that we have discussed above. The first way is by using simple ...
Postgresql-仅执行某些IF语句 我想通过使用UNION将一些查询的结果放在一起。但我只想执行一些查询。。。在下面的示例中,('Daily','Yearly')部分将自动填写。 大致如下: (if 'Daily' in ('Daily','Yearly') then my first query goes here... end if)...
Performance Consideration: Use CASE expressions in queries where possible, as they are optimized for SQL execution. Debugging: Use RAISE NOTICE in PL/pgSQL blocks to debug logic during development. All PostgreSQL Questions, Answers, and Code Snippets Collection....
PostgreSQL offers several decision-making statements such asIF,IF-THEN-ELSE,IF-THEN-ELSIF, etc. All these decision-driven statements are used to control the flow of the SQL statements based on specific criteria. In Postgres, theIFandIF-THEN-ELSEstatements evaluate only one condition; however, the...
PostgreSQL 11.4 (Ubuntu 11.4-1.pgdg19.04+1), Dbeaver 6.1.1. What I need? Return right values.What I do. Here is part of code.select if(available_count < 5, "neni skladem", "na sklade") as availability from ... Return this.SQL...