how to calibrate vaccum transmitter?
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Answer / vinay tripathi
A vacuum pressure transmitter is calibrated by taking reference of absolute zero pressure .
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SQL> desc product1; Name Null? Type ----------------------------------------- -------- ---------------------------- PROD_ID NOT NULL NUMBER(38) PROD_QTY NUMBER(38) SQL> select * from product1; PROD_ID PROD_QTY ---------- ---------- 123 300 124 200 SQL> desc pmsales; Name Null? Type ----------------------------------------- -------- ---------------------------- PROD_ID NOT NULL NUMBER(38) PMS_QTY NUMBER(38) SQL> select * from pmsales; PROD_ID PMS_QTY ---------- ---------- 123 100 124 200 SQL> create view pmas_prod 2 as select p.prod_id,p.prod_qty,pm.pms_qty 3 from product1 p,pmsales pm 4 where p.prod_id=pm.prod_id; View created. SQL> update pmas_prod 2 set prod_qty=prod_qty-pms_qty; 2 rows updated. SQL> select * from product1; PROD_ID PROD_QTY ---------- ---------- 123 200 124 0 SQL> insert into pmas_prod values(125,400,200); insert into pmas_prod values(125,400,200) * ERROR at line 1: ORA-01776: cannot modify more than one base table through a join view Q How can we insert into this table ?
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