Using Multiple Conditions with AND Similarly, you can use the AND operator to combine multiple conditions in the IF function. In this case, all conditions must evaluate to true for the value_if_true to be returned; otherwise, the value_if_false will be returned. Let’s modify our previous ...
Learn More » MySQL for OEM/ISV Over 2000 ISVs, OEMs, and VARs rely on MySQL as their products' embedded database to make their applications, hardware and appliances more competitive, bring them to market faster, and lower their cost of goods sold. ...
CASE N WHEN 1 THEN SELECT "One" WHEN 2 WHEN 3 THEN SELECT "Two or Three" ELSE SELECT "The number is outside range" CASE END; This gives a SQL syntax error. Thanks -- Jeff in Seattle Subject Written By Posted CASE with multiple consecutive WHEN(s) ...
If you do not use columns from all tables named in a query, MySQL stops scanning any unused tables as soon as it finds the first match. In the following case, assuming that t1 is used before t2 (which you can check with EXPLAIN), MySQL stops reading from t2 (for any particular row ...
使用foreachENcase when then 的基本用法 SELECT CASE WHEN b.is_leave = 0 THEN '在职' WHEN ...
Pass in this option multiple times to define multiple patterns, in which case the generated MySQL accounts use the same password. Note Router does not perform sanity checking and does not ensure that the pattern authorizes Router to connect. Note Bootstrapping reuses existing Router accounts by...
Applications should be prepared to handle the very rare case that a hashing function produces the same value for two different input values. One way to make collisions detectable is to make the hash column a primary key. Note Exploits for the MD5 and SHA-1 algorithms have become known. You...
迅速地;高速;急速地;急促;】. To the extent that the optimizer can use information about conditions on rows selected from one table and passed to the next, the more accurately【ˈækjərətli准确地;准确地,精确;正确,正确地;】 it can compute row estimates and choose the best execution...
Re: CASE with multiple consecutive WHEN(s) Peter Brawley February 19, 2008 03:08PM Re: CASE with multiple consecutive WHEN(s) Ahmad Hamadallah February 22, 2008 02:43AM Sorry, you can't reply to this topic. It has been closed.
setup_range_conditions tree = get_mm_tree(¶m, cond); 2. Fix the selectivity for SEL_ARGs by histogram fix_sel_tree_selectivity(¶m, tree); 3. Try to construct a QUICK_GROUP_MIN_MAX_SELECT group_trp = get_best_group_min_max(¶m, tree, &best_cost); 4. Try to construn...