小编ebe*_*beg的帖子

所以我有 ：

CREATE TABLE A (id INT,type int,amount int);
INSERT INTO A (id,type,amount) VALUES (1,0,25);
INSERT INTO A (id,type,amount) VALUES (2,0,25);
INSERT INTO A (id,type,amount) VALUES (3,1,10);


CREATE TABLE B (id INT,A_ID int,txt text);
INSERT INTO B (id,A_id,txt) VALUES (1,1,'abc');
INSERT INTO B (id,A_id,txt) VALUES (2,1,'def');
INSERT INTO B (id,A_id,txt) VALUES (3,2,'xxx');

我运行这个查询：

SELECT min(A.id), SUM(A.amount), COUNT(B.id) FROM A
LEFT JOIN B ON A.id = B.A_id
GROUP BY A.type

我得到：

min(A.id)   SUM(A.amount)   COUNT(B.id)
1           75              3
3           10              0

但我反而期望得到： …

我真的不明白我在做错了什么:

模板:

<embed [src]="pdfUrl" width="500" height="100%" type='application/pdf'>

类:

pdfURL;
constructor(private domSanitizer : DomSanitizer) {}
ngOnInit() {
    this.pdfUrl = this.domSanitizer.bypassSecurityTrustUrl('http://example.com/pdf.pdf')
}

这实际上不会加载<embed>但不会抛出错误.

我尝试使用SafeUrltype on pdfURL和with bypassSecurityTrustResourceUrl().该<embed>标签接收正确的URL,但不显示任何内容.