logo
Tags down

shadow

SQL Query to Fetch Two Records Per Each ID


By : Thanh Huỳnh
Date : September 15 2020, 11:00 AM
Hope that helps lets suppose i have this table
code :
WITH cte AS (SELECT id, 
                    class, 
                    ROW_NUMBER() OVER ( PARTITION BY id ORDER BY DBMS_RANDOM.NORMAL ) rn
             FROM test)
SELECT id, class
FROM cte 
WHERE rn <= 2


Share : facebook icon twitter icon

DB2 Query for fetching records from first query, if first query fails, then fetch from 2nd query


By : yuanye3486
Date : March 29 2020, 07:55 AM
this one helps. This is pretty straightforward if you formulate your requirements using logical predicates:
code :
Select 
  emp_id, emp_name 
from 
  empInfo 
where 
  addr_code=3
or
  (addr_code=1
  and
  not exists ( select 1 from empInfo where addr_code=3 ))

Sql query to fetch only few records from 1 column based on Condition and show/display it separately using Select query


By : Jenni
Date : March 29 2020, 07:55 AM
I wish this helpful for you EDITED: , Below query works fine as per my requirement:
code :
 Select * FROM
 ( 
 SELECT RequestID, Action, UserName as SubmitterName , CreatedDate AS  SubmitterDateTime
 FROM [tbl_WorkflowHistory]
 Where Action = 'Submit') as A

 Join

 (SELECT RequestID, Action, UserName as UpdateName , CreatedDate AS  UpdateDateTime
 FROM [tbl_WorkflowHistory]
 Where Action = 'Update') as B 

 ON A.RequestID=B.RequestID

Oracle query to fetch the count of distinct records based on another query's output


By : Michael Rowing
Date : March 29 2020, 07:55 AM
Any of those help I have a Oracle table (FILE_RECS) which has data in the following format: , You were almost there. Just group by the extracted file_name.
code :
SELECT substr(file_name,instr(file_name,'/',-1)+1,length(file_name)-instr(file_name,'/',-1)) AS FILE_NAME
,COUNT(*) as number_of_records
FROM FILE_RECS
GROUP BY substr(S,instr(file_name,'/',-1)+1,length(file_name)-instr(file_name,'/',-1))

I want to to fetch 100000 records by SQL query using MySql Xampp and save in an array but it doesn't fetch even 16000 an


By : Guy Benhaim
Date : March 29 2020, 07:55 AM
I hope this helps you . Not sure what is your exact requirement of this code.But your query efficiency seems very low. Your running too many queries that fetch only one row per query.
code :
    select id from shipment Limit 1 OFFSET 0
    select id from shipment Limit 1 OFFSET 1
    select id from shipment Limit 1 OFFSET 2
    select id from shipment Limit 1 OFFSET 3
    select id from shipment Limit 1 OFFSET 4
    select id from shipment Limit 1 OFFSET 5
    ...
//$link=  mysqli_connect("localhost","root","","example");
//if (mysqli_connect_error()) {
//    echo "error";
//}
$rows=array();
$count=0;
for( $J=0; $J<=3; $J++) {
    $count = $count + 10;
    for($i=1;$i<=$count;$i++) {
         $offset_var=$i-1;
         $query="select id from shipment Limit 1 OFFSET " . $offset_var;
         //$result=  mysqli_query($link, $query);
         //while ($row = mysqli_fetch_assoc($result)) {
         //    $rows[]= $row;
         //}
         echo $query."\n";
    }
}
//mysqli_close($connection);
//echo "<pre>";print_r($rows);echo "</pre>";
$link=  mysqli_connect("localhost","root","","example");
if (mysqli_connect_error()) {
    echo "error";
}
$rows=array();
$page_size=4000;
$total_records=100000;

$count=ceil($total_records/$page_size);
for($i=0; $i<=$count; $i++) {
   $offset_var = $i * $page_size;
   $query = "select id from shipment Limit ".$page_size." OFFSET ".$offset_var;
   $result=  mysqli_query($link, $query);
     while ($row = mysqli_fetch_assoc($result)) {
       $rows[]= $row;
     }
}
mysqli_close($connection);
echo "<pre>";print_r($rows);echo "</pre>";

bookshelf.js – how to fetch all records with empty query or no query at all?


By : user2546022
Date : March 29 2020, 07:55 AM
around this issue Is it possible to fetch all records of a table in bookshelf without a query? , I suppose model.fetchAll is the thing you are looking for.
Related Posts Related Posts :
  • how to update a record in a table via a sql command within an IF statement
  • SQL is evaluated Right to Left or Left to Right?
  • SQL Server aggregate functions issue
  • How can I subtract the system date to the a given date in oracle?
  • SQL Server create title field from records
  • Database design for Question-Answer-User entity. Especially where N-Level of Nested question is possible
  • Using variables in SQL Statment
  • Encountered the symbol "=" in oracle apex
  • UPDATE statement in SQL half working half not doing anything
  • SQL Server : Must declare the scalar variable
  • Refactor Oracle stored procedure to use BULK COLLECT
  • How can I fix my syntax error 3134 in this code?
  • Table ID (PrimaryKey) does not increment in a proper sequence in SQL Server
  • Is there an SQL operator in Amazon Redshift which is working as LIKE and IN operator together?
  • Group by two columns expecting all the values, selected from other table, in second column in oracle
  • Find average number of orders per customer in last three years?
  • REGEXP_SUBSTR Oracle | Extract a string between two delimiters
  • SQL view, default value if null
  • Time offset (Paris-Kuwait) incorrect timezone difference SQL Server
  • How to check period id and last updated value then assign to variable?
  • Update different columns in multiple tables by joining them
  • SQL query that prevents Excel from converting long integer to scientific notation
  • How to make valid combinations of many separate tables with subcombinations
  • SELECTING from same field in 2 column
  • ORA-38104: Columns referenced in the ON Clause cannot be updated c.emp_id
  • TSQL: Case when ... end as '
  • SQL Server trigger that stops rows from being added to a table if one of the columns has a value that is not already in
  • What's the recommended way to do database migrations with Ktor + Exposed (Kotlin)?
  • PL/SQL Autoregressive forecasting
  • Extract data from XML using T-SQL query
  • Splitting a column and adding text value to the numerical value
  • selecting minimum value depending on other value
  • SQL update id in table except rows with duplicate data in column
  • SQL Execute a procedure only when the table is not empty?
  • how to derive filter condition from table rows
  • Adding same ID to same rows
  • ODBC Connection / Crystal Reports
  • Problems with updating column from another table in postgresql
  • Querying a messy table in SQL
  • Marking users as not active if they don't have required records
  • Check constraint depending on another table (mutually exclusive relation)
  • Order by error in create view in SQL Server
  • SQL Double Group by query
  • How to use alias in INSERT query?
  • Exempting sunday from oracle sql script
  • Using SQL CONTAINS with multiple words inside a variable
  • Subqueries vs Multi Table Join
  • How to get an array subquery using postgress sql?
  • SQL: How to group records, when they have different types
  • Passing NULL as Value in Parameter for T-SQL stored procedure
  • sql queries side by side
  • Does ROW_NUMBER() support OVER(ORDER BY 1)?
  • PostgreSQL calculate difference between multi rows
  • multiple where statements in proc sql
  • Find the Week from a date passed as input oracle
  • Get month wise YTD
  • can we use two different queries with CTE table in sql server
  • what is actual difference between or operator and in operator in sql
  • How to improve the execution time of inserting to a table from selecting rows from a table of million rows in ORACLE?
  • How do I Select Counts with Spark SQL Without Getting Errors?
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk