INTERSECT returns all rows that are both in the result of queryl and in the result of query2.两个查询共有的部分,相交的部分输出并且去重,all就不去重 EXCEPT returns all rows that are in the result of queryl but not in the result of 'query2. Combining Query eliminates duplicate rows from ...
(11 rows) [/code] 3.) Install the Indicator and the DLL to MT4 3.1) Stop MT4 3.2) Copy the mt4psql.dll to MQL4\Libraries 3.3) Copy the PQ_Writer.mq4 to MQL4\Indicators 3.4) Create a copy of the settings file "MQL4/Files/PQWriter_DB_Config_FXCM.set 3.5) Adapt the settings in ...