常见DATE类型操作
select sysdate from dual;
-- 2021-06-03 15:27:15
select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;
-- 2021-06-03 15:27:15
select to_date('2021-06-03 23:59:59','yyyy-MM-dd hh24:mi:ss') from dual;
-- 2021-06-03 23:59:59
select to_date(concat(to_char(sysdate,'yyyy-MM-dd'),' 23:59:59'),'yyyy-MM-dd hh24:mi:ss') from dual;
-- 2021-06-03 23:59:59
select to_char(sysdate, 'yyyy' ) from dual;
-- 年
-- 2021
select to_char(sysdate, 'MM' ) from dual;
-- 月
-- 06
select to_char(sysdate, 'dd' ) from dual;
-- 日
-- 03
select to_char(sysdate, 'Q') from dual;
-- 季
-- 2
select to_char(sysdate, 'iw') from dual;
-- 周
-- 22
-- 按日历上的那种，每年有52或者53周
自建表测试
用于测试的表结构和数据
CREATE TABLE "VICEL"."TEST"
( "BATCH" VARCHAR2(255),
"NAME" VARCHAR2(255),
"PRODUCE_DATE" DATE
) ;
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次1', '产品1', TO_DATE('2021-05-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次1', '产品1', TO_DATE('2021-05-02 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次1', '产品3', TO_DATE('2021-05-03 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次1', '产品3', TO_DATE('2021-05-04 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次1', '产品2', TO_DATE('2021-05-05 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次2', '产品2', TO_DATE('2021-05-06 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次2', '产品2', TO_DATE('2021-05-07 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次2', '产品1', TO_DATE('2021-05-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次2', '产品1', TO_DATE('2021-06-03 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次2', '产品3', TO_DATE('2021-06-03 01:30:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次3', '产品3', TO_DATE('2021-06-03 23:30:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次3', '产品3', TO_DATE('2021-06-03 23:59:59', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次3', '产品2', TO_DATE('2021-05-13 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次3', '产品2', TO_DATE('2021-05-14 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
INSERT INTO "VICEL"."TEST"("BATCH", "NAME", "PRODUCE_DATE") VALUES ('批次3', '产品1', TO_DATE('2021-05-15 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'));
示例查询语句
SELECT
*
FROM
TEST
WHERE
-- 日期->字符串->日期
-- 当前系统时间为2021-06-03
TEST.PRODUCE_DATE >=to_date(to_char(sysdate,'yyyy-MM-dd'),'yyyy-MM-dd hh24:mi:ss')
AND TEST.PRODUCE_DATE <=to_date(concat(to_char(sysdate,'yyyy-MM-dd'),' 23:59:59'),'yyyy-MM-dd hh24:mi:ss');
SELECT
*
FROM
TEST
WHERE
-- 字符串->日期
TEST.PRODUCE_DATE >=to_date('2021-06-03','yyyy-MM-dd hh24:mi:ss')
AND TEST.PRODUCE_DATE <=to_date(concat('2021-06-03',' 23:59:59'),'yyyy-MM-dd hh24:mi:ss');
结果集
