大约有 300 项符合查询结果（耗时：0.0175秒） [XML]
Invalid default value for 'create_date' timestamp field
... must be within that range.
Other odd, related, behavior:
CREATE TABLE tbl1 (
ts TIMESTAMP);
Query OK, 0 rows affected (0.01 sec)
CREATE TABLE tbl2 (
ts TIMESTAMP,
ts2 TIMESTAMP);
ERROR 1067 (42000): Invalid default value for 'ts2'
CREATE TABLE tbl3 (
ts TIMESTAMP,
ts2 TI...
Truncating all tables in a Postgres database
...ION f_truncate_tables(_username text)
RETURNS void AS
$func$
DECLARE
_tbl text;
_sch text;
BEGIN
FOR _sch, _tbl IN
SELECT schemaname, tablename
FROM pg_tables
WHERE tableowner = _username
AND schemaname = 'public'
LOOP
RAISE NOTICE '%',
-- EXE...
select into in mysql
...dev.mysql.com/doc/refman/5.0/en/create-table-select.html
CREATE TABLE new_tbl SELECT * FROM orig_tbl;
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How to remove a TFS Workspace Mapping?
...tings might be in the Tfs_DefaultCollection database. Mapping is stored in tbl_WorkingFolder.LocalItem.
/*Find correct workspace*/
SELECT WorkspaceId, *
FROM tbl_Workspace
ORDER BY WorkspaceName
/*View the existing mapping*/
SELECT LocalItem, *
FROM tbl_WorkingFolder
WHERE WorkspaceId = <<Wo...
Can PHP PDO Statements accept the table or column name as parameter?
...ery( $get_var )
{
switch($get_var)
{
case 1:
$tbl = 'users';
break;
}
$sql = "SELECT * FROM $tbl";
}
By leaving no default case or using a default case that returns an error message you ensure that only values that you want used get used.
...
What is the difference between a stored procedure and a view?
...n from Microsoft as to when and why to use each.
Say I have two tables:
tbl_user, with columns: user_id, user_name, user_pw
tbl_profile, with columns: profile_id, user_id, profile_description
So, if I find myself querying from those tables A LOT... instead of doing the join in EVERY piece of SQ...
How to import multiple .csv files at once?
...ccinct tidyverse solution:
(more than twice as fast as Base R's read.csv)
tbl <-
list.files(pattern = "*.csv") %>%
map_df(~read_csv(.))
and data.table's fread() can even cut those load times by half again. (for 1/4 the Base R times)
library(data.table)
tbl_fread <-
list.f...
How to delete all rows from all tables in a SQL Server database?
..."
declare @catalog nvarchar(250);
declare @schema nvarchar(250);
declare @tbl nvarchar(250);
DECLARE i CURSOR LOCAL FAST_FORWARD FOR select
TABLE_CATALOG,
TABLE_SCHEMA,
TABLE_NAME...
MySQL Error 1093 - Can't specify target table for update in FROM clause
...as two different things, allowing destructive changes to go ahead.
UPDATE tbl AS a
INNER JOIN tbl AS b ON ....
SET a.col = b.col
Alternatively, try nesting the subquery deeper into a from clause ...
If you absolutely need the subquery, there's a workaround, but it's
ugly for several reasons, inc...
How can I easily view the contents of a datatable or dataview in the immediate window
...oject:
#region Dataset -> Immediate Window
public static void printTbl(DataSet myDataset)
{
printTbl(myDataset.Tables[0]);
}
public static void printTbl(DataTable mytable)
{
for (int i = 0; i < mytable.Columns.Count; i++)
{
Debug.Write(mytable.Columns[i].ToString() + "...