大约有 300 项符合查询结果（耗时：0.0298秒） [XML]
SQL update fields of one table from fields of another one
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This is a great help. The code
UPDATE tbl_b b
SET ( column1, column2, column3)
= (a.column1, a.column2, a.column3)
FROM tbl_a a
WHERE b.id = 1
AND a.id = b.id;
works perfectly.
noted that you need a bracket "" in
From "tbl_a" a
to make it ...
SQL Server - copy stored procedures from one db to another
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$db = New-Object ("Microsoft.SqlServer.Management.SMO.Database")
$tbl = New-Object ("Microsoft.SqlServer.Management.SMO.Table")
$scripter = New-Object Microsoft.SqlServer.Management.SMO.Scripter($srvConn)
# Get the database and table objects
$db = $srv.Databases[$database]
$tbl ...
How to alter a column's data type in a PostgreSQL table?
...w.postgresql.org/docs/current/interactive/sql-altertable.html
ALTER TABLE tbl_name ALTER COLUMN col_name TYPE varchar (11);
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Concatenate multiple result rows of one column into one, group by another column [duplicate]
...9.0 or later):
SELECT movie, string_agg(actor, ', ') AS actor_list
FROM tbl
GROUP BY 1;
The 1 in GROUP BY 1 is a positional reference and a shortcut for GROUP BY movie in this case.
string_agg() expects data type text as input. Other types need to be cast explicitly (actor::text) - unless an ...
Django in / not in query
...s solution and ran into a problem, so if it happens to anyone else... Objs=Tbl1.objects.filter(...); IDs=Objs.values_list('id', flat=True); Objs.delete(); Tbl2.objects.filter(id__in=IDs') This did not work because IDs is actually a QuerySet object. When I deleted the rows it originated from, it no l...
How to 'insert if not exists' in MySQL?
...l.com
INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE]
[INTO] tbl_name [(col_name,...)]
{VALUES | VALUE} ({expr | DEFAULT},...),(...),...
[ ON DUPLICATE KEY UPDATE
col_name=expr
[, col_name=expr] ... ]
Or:
INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE]...
How to get a complete list of ticker symbols from Yahoo Finance? [closed]
...Now, you can extract the Tickers from the table on that page
library(XML)
tbl <- readHTMLTable(URL, stringsAsFactors=FALSE)
dat <- tbl[[tail(grep("Ticker", tbl), 1)]][-1, ]
colnames(dat) <- dat[1, ]
dat <- dat[-1, ]
etfs <- dat$Ticker # All ETF tickers from yahoo
length(etfs)
#[1] 14...
Select rows which are not present in other table
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this can also be tried...
SELECT l.ip, tbl2.ip as ip2, tbl2.hostname
FROM login_log l
LEFT JOIN (SELECT ip_location.ip, ip_location.hostname
FROM ip_location
WHERE ip_location.ip is null)tbl2
...
How do write IF ELSE statement in a MySQL query
...ion = 2 and state = 0)
THEN
1
ELSE
0
END)
as state from tbl1;
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Display names of all constraints for a table in Oracle SQL
...CT COLUMN_NAME, CONSTRAINT_NAME FROM USER_CONS_COLUMNS WHERE TABLE_NAME = 'TBL_CUSTOMER';
--OR FOR LESS DETAIL
SELECT CONSTRAINT_NAME FROM USER_CONSTRAINTS WHERE TABLE_NAME = 'TBL_CUSTOMER';
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