CREATE OR REPLACE FUNCTION create_short_animal_id_1() RETURNS trigger LANGUAGE plpgsql AS $$ BEGIN SET NEW.animal_id = CONCAT(species, '-', capture_year, '-', tag_num); RETURN NEW; END; $$; 这是尝试创建函数时的错误消息: ERROR: syntax error at or near "(" LINE 7: SET NEW.anim...
The string function concat_ws() (Postgres 9.1+) does the same as MySQL's concat_ws() - when not abused as aggregate function. It's particularly useful to deal with null values: SELECT concat_ws(';', field1, field2, field3) FROM tbl You could even combine both to aggregate multipl...
SELECT concat(CAST(current_value AS CHAR),“,”,CAST(increment AS CHAR)) INTO retval FROM MYCAT_SEQUENCE WHERE name = seq_name; RETURN retval; END DELIMITER; 2. 设置 sequence 值 DROP FUNCTION IF EXISTS mycat_seq_setval; DELIMITER CREATE FUNCTION mycat_seq_setval(seq_name VARCHAR(50),val...
第一种,最朴实的方法就是 pg_dump --schema-only 导出全部的表结构 第二种,创建一个function,具体如下: 代码语言:javascript 复制 CREATEORREPLACEFUNCTIONtabledef(text,text)RETURNStextLANGUAGEsqlSTRICTAS$$WITHattrdefAS(SELECTn.nspname,c.relname,c.oid,pg_catalog.array_to_string(c.reloptions||array(sel...
SELECTd.department_name"部门名称",concat(e.first_name,',',e.last_name)"姓名",e.salary"月薪",ROW_NUMBER()OVER(PARTITIONBYe.department_idORDERBYe.salaryDESC)AS"row_number",RANK()OVER(PARTITIONBYe.department_idORDERBYe.salaryDESC)AS"rank",DENSE_RANK()OVER(PARTITIONBYe.department_idORDERBYe....
create or replace type distinct_concat_type as object --对象变量 cat_string varchar2(4000), --对象初始化 static function odciaggregateinitialize(cs_ctx in out distinct_concat_type) return number, --聚合函数的迭代方法(这是最重要的方法)
concat(str, ...) 函数用于连接字符串,并且忽略其中的 NULL 参数;concat_ws(sep, str, ...) 函数使用指定分隔符 sep 连接字符串。 SELECT concat(2, NULL, 22), concat_ws(' and ', 2, NULL, 22); | concat | concat_ws | |---|---| | 222 | 2 and 22 | 两个竖杠(||)也可以用于连...
In PostgreSQL, the CONCAT() function accepts multiple strings as arguments and concatenates them to a single string. Strings can be char, text, or varchar.
CREATEFUNCTIONconcat_lower_or_upper(atext, btext, uppercase booleanDEFAULTfalse)RETURNStextAS$$SELECTCASEWHEN$3THENUPPER($1||''||$2)ELSELOWER($1||''||$2)END; $$ LANGUAGE SQL IMMUTABLE STRICT; 函数concat_lower_or_upper有两个强制参数,a和b。此外,有一个可选的参数uppercase,其默认值为false...
CREATE OR REPLACE FUNCTION some_f() RETURNS text AS $func$ DECLARE r record; q text; BEGIN for r in select concat(from_tbl_schema,'.',from_tbl_name)::text as main_t_name, concat(arch_schema,'.',arch_tbl_name)::text as arch_t_name, where_clause::text ...