创建oracle数据表示例sql

CREATE TABLE "BRAND_RELATION"
(
"ID" NUMBER(10,0) NOT NULL ENABLE,
"CATID" NUMBER(10,0) NOT NULL ENABLE,
"BRAND_ID" NUMBER(10,0) NOT NULL ENABLE,
PRIMARY KEY ("ID")
);
CREATE SEQUENCE "BR_ID_SEQ" NOCACHE;

CREATE INDEX "BR_CATID" ON "BRAND_RELATION" ("CATID");
CREATE INDEX "BR_BRAND_ID" ON "BRAND_RELATION" ("BRAND_ID");

CREATE OR REPLACE TRIGGER "BR_ID_TRG" BEFORE INSERT ON "BRAND_RELATION" REFERENCING OLD AS "OLD" NEW AS "NEW" FOR EACH ROW ENABLE
DECLARE
v_newVal NUMBER(12) := 0;
v_incval NUMBER(12) := 0;
BEGIN
IF INSERTING AND :new.id IS NULL THEN
SELECT BR_ID_SEQ.NEXTVAL INTO v_newVal FROM DUAL;
-- If this is the first time this table have been inserted into (sequence == 1)
IF v_newVal = 1 THEN
--get the max indentity value from the table
SELECT NVL(max(id),0) INTO v_newVal FROM BRAND_RELATION;
v_newVal := v_newVal + 1;
--set the sequence to that value
LOOP
EXIT WHEN v_incval>=v_newVal;
SELECT BR_ID_SEQ.nextval INTO v_incval FROM dual;
END LOOP;
END IF;
--used to emulate LAST_INSERT_ID()
--mysql_utilities.identity := v_newVal;
-- assign the value from the sequence to emulate the identity column
:new.id := v_newVal;
END IF;
END;