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SQL variable to hold list of integers
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Table variable
declare @listOfIDs table (id int);
insert @listOfIDs(id) values(1),(2),(3);
select *
from TabA
where TabA.ID in (select id from @listOfIDs)
or
declare @listOfIDs varchar(1000);
SET @listOfIDs = ',1,2,3...
Counting null and non-null values in a single query
I have a table
26 Answers
26
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select into in mysql
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Use the CREATE TABLE SELECT syntax.
http://dev.mysql.com/doc/refman/5.0/en/create-table-select.html
CREATE TABLE new_tbl SELECT * FROM orig_tbl;
share
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Clustered vs Non-Clustered
... PersonId means that the rows will be physically sorted by PersonId in the table, allowing an index search on this to go straight to the row (rather than a non-clustered index, which would direct you to the row's location, adding an extra step).
That said, it's unusual for the primary key not to be...
SQL Server NOLOCK and joins
...argument, just your original question.
Yes, you need WITH(NOLOCK) on each table of the join. No, your queries are not the same.
Try this exercise. Begin a transaction and insert a row into table1 and table2. Don't commit or rollback the transaction yet. At this point your first query will retu...
Table with fixed header and fixed column on pure css
I need to create a html table (or something similar looking) with a fixed header and a fixed first column.
20 Answers
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MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...
...一天被掩盖的问题会再次爆发出来。
Percona Toolkit里的pt-table-checksum和pt-table-sync可以搞定此类问题。它们的安装很简单，可以依照自己的操作系统选择下载rpm或者deb软件包来安装，当然也可以使用源代码来安装，不过要注意的是...
CHECK constraint in MySQL is not working
First I created a table like
8 Answers
8
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Numbering rows within groups in a data frame
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Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
library(plyr)
ddply(df, .(cat), mutate, id = seq_along(val))
or:
library(dplyr)
df %>% group_by(cat) %>% mutate(id = row_number())
or (the most memor...
For each row return the column name of the largest value
...partment name, rather than the number of roster counts, from the frequency table. A simple example below (column names = departments, row names = employee ids).
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