w9 statement

MySQL SELECT statement and mysqlselect statement SELECT statement: The products table is as follows: A selects a column FROM a table: mysql> SELECT prod_name FROM products; B. Retrieve multiple columns FROM the table: mysql> SELECT prod_id, prod_name FROM products; C. Retrieve all columns: mysql> SELECT * FROM products; // see the first figure. D. Retrieve

During this time, writing of LINQ and SQL is missing! Or are you getting old? More and more will not change Problem: ========================================================== ======== VaR ret = from X in LSWhere (String. isnullorempty (Arg. querytext )? True:((X. ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. B ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. c ?? ""). Toupper (). Contains (Arg. querytext. toupper ()))I can see this

1. insert into select statementStatement format: Insert into Table2 (field1, field2,...) select value1, value2,... from Table1 The target table Table2 must exist. Because the target table Table2 already exists, We can insert constants in addition to the fields in the source table Table1. Example: Insert into select statement to copy table dataCopy codeThe Code is as follows: -- 1. Create a test tableCreate TABLE Table1(A varchar (10 ),B varchar (10 )

Oracle condition selection statement and loop statement Oracle Condition Selection statements (IF, CASE), LOOP statements (LOOP, WHILE, and FOR), and sequential control statements (GOTO, NULL ).1. IF condition selection statement1.1 simple condition judgment DECLAREV_sal NUMBER (6, 2 );BEGINSELECT sal INTO v_sal FROM emp WHERE lower (ename) = lower (' name ');IF v_sal UPDATE emp SET sal = v_sal + 200 WHERE

1. insert into select statementStatement format: Insert into Table2 (field1, field2,...) select value1, value2,... from Table1The target table Table2 must exist. Because the target table Table2 already exists, We can insert constants in addition to the fields in the source table Table1. Example:Insert into select statement to copy table dataCopy codeThe Code is as follows:-- 1. Create a test tableCreate TABLE Table1(A varchar (10 ),B varchar (10 ),C v

ArticleDirectory In the SQL statement, the as statement can have the same name as the front field. In the SQL statement, the as statement can be the same as the preceding field: Select *, CaseMycolumnnameWhen '0' then' outbound 'when' 1 'then' inbound 'endMycolumnnameFrom mytablenameIt turns out that the name c

UPDATE statement: the statement that updates the fields in one table to the fields in another table adds a field to a table in one table in the modification of the result query system, now we need to copy the corresponding ID of another table. because such SQL operations are not often used, we even think of writing a loop for processing. However, I thought that SQL should be able to implement such a functio

PHP commonly used in the collection of statements, PHP common statement collection Empty data table truncate table name; Http://blog.knowsky.com/234205.htm Common instances of SQL statements http://blog.csdn.net/vericlongmore/article/details/7431029 PHP MySQL database common SQL statement command collection http://www.banghui.org/10064.html PHP A common SQL statement