1、PostgreSQL迁移到dmdb——之等效替换FILTER问题

1.1、PostgreSQL的sql

count(*) filter(
	where
		"archivestate" = '待整理'
		and "sjdqzt" = '待整理'
	) as "count_unfiled"

1.2、替换方案

 SUM(CASE WHEN "archivestate" = '待整理' 
	AND "sjdqzt" = '待整理'  THEN 1 ELSE 0 END) AS "count_unfiled"

2、PostgreSQL迁移到dmdb——之等效替换extract问题

2.1、PostgreSQL的sql

select extract(epoch from SYSDATE)

2.2、替换方案

 select UNIX_TIMESTAMP(SYSDATE)

3、PostgreSQL迁移到dmdb——之等效替换STRPOS问题

3.1、PostgreSQL的sql

select strpos('1q3','q3')

3.2、替换方案

select INSTR('1q3','q3')

4、PostgreSQL迁移到dmdb——之等效替换STRING_AGG 问题

4.1、PostgreSQL的sql

STRING_AGG (D.LABEL,
								','order by
								d.sort )

4.2、替换方案

listagg(
								D.LABEL,
								','
							)within group(
							order by
								d.sort
							)