如果ARRAY数组a中存在元素不满足predicate条件,返回结果为False。 如果ARRAY数组a中存在元素为NULL,且其他元素都满足predicate条件,返回结果为NULL。 示例 示例1:判断ARRAY数组array(4, 5, 6)的所有元素是否满足x x > 3条件(所有元素大于3)。命令示例如下。 --返回true。 select all_match(arra
SELECT(选择) SELECT说起来大家都不陌生,它是SQL中最常见的语法,主要用法是从数据表中选择你想要的那几列数据。...UPDATE Customers SET cust_email = 'kim@thetoystore.com' INSERT(插入) INSERT插入可以在数据表中插入完整的行,插入行的...
SELECTcustomer_id,(SELECTAVG(order_amount)FROMorders)ASaverage_order_amountFROMcustomers;-- 查找交易...
string sql=String.Format(@"INSERTINTOjk_users(user_login,user_pass,user_nicename,user_email,user_status,display_name,user_url,user_activation_key)VALUES('{0}','{1}','{2}','{3}','{4}','{5}','{6}','{7}')",userLogin,userPass,userNicename,userEmail,userStatus,displayName,userUr...
JOIN Employees e ON rs.Region = e.Region WHERE rs.Region IN (SELECT Region FROM Top...
string>SELECTsubstring('hello','1',2); he-- Downcasting of a BIGINT to an INT>SELECTsubstring('hello',1L,2); he-- Crosscasting from STRING to INTEGER>SELECTsubstring('hello',str,2)FROMVALUES(CAST('1'ASSTRING))AST(str); he-- Crosscasting from INTEGER to STRING>SELECTsubstring(123...
INSERT INTO test_scan VALUES (1, 2, 3, 4); --支持Fixed Plan SET hg_experimental_enable_fixed_dispatcher_for_scan = ON; SELECT * FROM test_scan WHERE pk1 = 1 AND pk2 = 2; --支持Fixed Plan SET hg_experimental_enable_fixed_dispatcher_for_scan = ON; SELECT * FROM test_scan WHERE...
select*from user where username=#{username} and sex=#{sex} </select> if 语句使用方法简单,常常与 test 属性联合使用。语法如下: <iftest="判断条件">SQL语句</if> 2)使用动态sql 上面的查询语句,我们可以发现,如果#{username}为空,那么查询结果也是空,如何解决这个问题呢?使用 if 来判断,可多个 if ...
Accessor; DBCOUNTITEM lNumRowsRetrieved; HROW hRows[10]; HROW* pRows = &hRows[0]; int main() { // The command to execute. WCHAR* wCmdString = OLESTR("SELECT StandardCost, ListPrice FROM Production.Product WHERE ListPrice > 14.00"); // Cal...
EXECUTE sp_execute_external_script @language = N'R' , @script = N' df1 <- as.data.frame( array(1:6) ); df2 <- as.data.frame( c( InputDataSet , df1 )); OutputDataSet <- df2' , @input_data_1 = N' SELECT [Col1] from RTestData;' WITH RESULT SETS (( [Col2] int n...