Question

我正在尝试根据今天的日期从表中的文件中读取文件。例如，如果今天是11月21日，我想显示LIST_21-11-2018。这是我的查询：

CREATE TABLE "FILE_LIST" (
"FILENAME" VARCHAR2(40),
"STATUS" CHAR(1 Byte)
);

INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_20-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_21-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_22-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_23-11-2018','N');

SELECT FILENAME FROM FILE_LIST WHERE FILENAME LIKE %'TO_CHAR(SYSDATE,'DD-MM-YYYY')'% AND STATUS = 'N'

LIKE语句似乎无效。希望知道我的错误是....

Answer 1

尝试一下：

SELECT FILENAME FROM FILE_LIST WHERE FILENAME LIKE '%' || TO_CHAR(SYSDATE,'DD-MM-YYYY') || '%' AND STATUS = 'N';

Answer 2

％字符必须位于要查找的字符串中：

CREATE TABLE "FILE_LIST" (
"FILENAME" VARCHAR2(40),
"STATUS" CHAR(1 Byte)
);

INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_20-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_21-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_22-11-2018','N');
INSERT INTO "FILE_LIST" ("FILENAME","STATUS") VALUES('LIST_23-11-2018','N');

SELECT FILENAME FROM FILE_LIST WHERE FILENAME LIKE '%' + TO_CHAR(SYSDATE,'DD-MM-YYYY') + '%' AND STATUS = 'N'

使用SQL Like语句查找特定值

2 个答案: