使用INNER JOIN返回设置表中多个值匹配的记录 带有'if‘语句的多个条件 使用带有多个按钮的"this“ 带有嵌套对象的Elasticsearch OR查询返回与条件不匹配的inner_hits 第一列OpenQuery上的SQL Distinct 检查div-container是否有多个div-inner no jQuery INNER和IN的组合:Oracle Sql ...
从Oracle导入数据到SQL Server的时间时区问题 近期在使用MSSQL 2005建立Link Server连接Oracle数据库,通过Open Query从Oracle导入数据到SQL Server的过程中,发现Oracle中的日期类型的字段在导入到SQL...Server是会自动转换为UTC国际标准时区,也就是GMT+00:00,而中国的时区是GMT+8的,所以只能在导入数据后,批...
INNER JOIN stock_table1 ON stock_table3.BARCODE = stock_table1.BARCODE"; $dbquery = mysqli_query($connect,$sql); while ($result = mysqli_fetch_array($dbquery, MYSQLI_ASSOC)) { $BARCODE = $result["BARCODE"]; $NAME = $result["NAME"]; ...
Alternative of CURSOR in SQL to improve performance ? alternative query for in clause Alternative to Full Outer Join Alternative to Row_Number Query Alternative way STUFF for XML PATH ('') ? Am getting an error when i run this code Ambiguous Column Name An aggregate may not appear in the ...
query= SELECT * FROM t1 AS ta WHERE ta.a IN (SELECT c FROM t2 AS tb WHERE tb.d >= SOME(SELECT SUM(g) FROM t4 as tc GROUP BY f HAVING ta.a=tc.f)); set @@optimizer_switch='materialization=off,semijoin=off'; eval $query; set @@optimizer_switch='materialization=off,semijoin=...
I'm sure the "self-proclaimed" performance-analysis champions in most of the companies will reject it due to the usage of Sub-query Anyway I'll try to run a SQL trace & a runtime-analysis to compare the results of this sub-query against INNER JOIN. BR, Suhas Reply UweFetzer_se38...
The following query that should be equivalent, gives correct result: select * from t1 join t2 using(v) order by 1; Plans are different, though: mysql> explain select * from t1 join t2 on t1.v = t2.v order by 1\G *** 1. row *** id: 1 select_type: SIMPLE table: t2 type:...
More than often you "scan" twice or more in FAE while using only one join query you have only one "scan" by the database. "Scan" can mean full table or index, index lookups, sort-merge / hash/ nested loops joins (depends on database vendor). > In nutsheel i wan to understand...
the PL/SQL engine sports anabstractcursorinterfaceto the underlying database. “The cursor interface we came up with to separate the database from PL/SQL was one of the neatest parts,” recalls Kendall. In Oracle, the PL/SQL cursor interface is mapped to the database kernel query layer whi...
Alternative of CURSOR in SQL to improve performance ? alternative query for in clause Alternative to Full Outer Join Alternative to Row_Number Query Alternative way STUFF for XML PATH ('') ? Am getting an error when i run this code Ambiguous Column Name An aggregate may not appear in the ...