一.锁定某一行记录进行查询更新
select t.*,t.rowid from T_KB01 t where t.FLX_MED_ORG_ID = 'S5113001901010000002'
select * from T_KB01 for update (不建议，统筹容易锁表）
二、查询行数小于多少条
select * from t_kb01 where rownum <=600
三、日期范围内查询
（1）select sum(t.zfy) from jksh.ck10_jsmx t left join ck10_ghdj t1 on t.ghdjid=t1.id
where t.jsrq>=to_date('01-02-2018 00:00:00', 'dd-mm-yyyy hh24:mi:ss')
and t.jsrq<to_date('01-03-2018 00:00:00', 'dd-mm-yyyy hh24:mi:ss')
（2）select sum(t.zfy) from jksh.ck10_jsmx t left join ck10_ghdj t1 on t.ghdjid=t1.id
where t.jsrq BETWEEN TO_NUMBER('20200500000001') AND TO_NUMBER('20200501235959')
四、刷新物化视图
BEGIN
DBMS_MVIEW.REFRESH (
list => 'ST_MMAP_43.F_RPT_BASY', --普通用户+试图名称
Method =>'COMPLETE',
refresh_after_errors => True);
end;
五、删除物化视图
DROP MATERIALIZED VIEW 表名；
六、更新列，将ab表相关的列更新到b表中
update t_data_detection_tbl a set a.overall_cd=(select b.OVERALL_CD_ORG from t_kc21 b where b.med_clinic_id =a.med_clinic_id);
update t_data_detection_tbl a set a.hospital_id=(select b.FLX_MED_ORG_ID from t_kc21 b where b.med_clinic_id =a.med_clinic_id);
七、查询的数据与字典表进行关联
select b.item,b.itemType,a.totalCost,b.ovePay from summer a ,(select * from pay b where b.item='pay_type') b
where b.item=a.item_value and …… group by b.item,b.itemType
八、case when 的用法
select
CASE
when crowd_type = '1' then
'青年男性'
when crowd_type = '2' then
'青年女性'
when crowd_type = '3' then
'中年男性'
when crowd_type = '4' then
'中年女性'
when crowd_type = '5' then
'老年男性'
when crowd_type = '6' then
'老年女性'
else
'7'
end, sum(med_amout)
from T_CROWD_TYPE_SUMMARY_TBL
group by crowd_type