使用IF将T-SQL转换为Postgres

Question

IF NULLIF(@date, '') IS NULL
select * from [dbo].[SRC_DSSI_OPER_STAT]
else
select * from [dbo].[SRC_DSSI_OPER_STAT] where CONVERT(DATE, (shift_start_date)) =  CONVERT(DATE, @date - 1)

How can i convert this T-sql code to PostgreSQL

Answer 1

Supposing @date is a string, in postgresql I will call it input_date

IF input_date = '' THEN
    select * from "SRC_DSSI_OPER_STAT";
ELSE
    select * from "SRC_DSSI_OPER_STAT" where shift_start_date::date =  input_date - interval '1' day;
END IF;

You can have problems about your date format, in that case you must working more on date conversions.