消息 156，级别 15，State 1，第 5 行关键字“LEFT”附近的语法不正确。 消息 156，级别 15，State 1，第 6 行 'b' 附近的语法不正确

Question

USE [pfebd]
SELECT *
FROM TBCSBONNV a
WHERE TBCSJRNE<=20210422 AND TBCSECHE >=20210422 AND TBCSDBSC<=20210422 
LEFT JOIN 
(SELECT DISTINCT CPGCTGS ,CPGCPT,CPTENUM FROM CPTAXNV )b
ON a.TBCSAGCC=b.CPGCTGS AND a.TBCSNUCC=b.CPTENUM;

Answer 1

JOIN is an operator in the FROM clause. The WHERE clause follows the FROM clause. So you seem to want:

SELECT c.*, a.*
FROM TBCSBONNV c LEFT JOIN
     (SELECT DISTINCT CPGCTGS, CPGCP, CPTENUM
      FROM CPTAXNV a
     ) a
     ON c.TBCSAGCC = a.CPGCTGS AND c.TBCSNUCC = a.CPTENUM;
WHERE c.TBCSJRNE <= 20210422 AND
      c.TBCSECHE >= 20210422 AND
      c.TBCSDBSC <= 20210422 ;

I replaced the table aliases with aliases that seem related to the table names TB C SBONNV and CPT A XNV.